From c6b2b4025206c7fc4cf9376302305d7c56cd2068 Mon Sep 17 00:00:00 2001
From: cooper-lzy <78672629+cooper-lzy@users.noreply.github.com>
Date: Mon, 13 Sep 2021 14:07:47 +0800
Subject: [PATCH 1/2] add cn doc (#708)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* add cn doc

* concat and show meta leader

* Update 13.concat.md

Co-authored-by: 朱晓青 <86282370+izhuxiaoqing@users.noreply.github.com>
---
 .../6.functions-and-expressions/13.concat.md  | 109 ++++++++++++++++++
 .../6.show/19.show-meta-leader.md             |  27 +++++
 .../1.authentication/4.ldap.md                | 103 +++++++++++++++++
 .../improve-query-by-tag-index.md             |  53 +++++++++
 mkdocs.yml                                    |   6 +-
 5 files changed, 297 insertions(+), 1 deletion(-)
 create mode 100644 docs-2.0/3.ngql-guide/6.functions-and-expressions/13.concat.md
 create mode 100644 docs-2.0/3.ngql-guide/7.general-query-statements/6.show/19.show-meta-leader.md
 create mode 100644 docs-2.0/7.data-security/1.authentication/4.ldap.md
 create mode 100644 docs-2.0/8.service-tuning/improve-query-by-tag-index.md

diff --git a/docs-2.0/3.ngql-guide/6.functions-and-expressions/13.concat.md b/docs-2.0/3.ngql-guide/6.functions-and-expressions/13.concat.md
new file mode 100644
index 00000000000..7be8e392f96
--- /dev/null
+++ b/docs-2.0/3.ngql-guide/6.functions-and-expressions/13.concat.md
@@ -0,0 +1,109 @@
+# concat function
+
+The `concat()` and `concat_ws()` functions return strings concatenated by one or more strings.
+
+## concat() function
+
+The `concat()` function requires at least two or more strings. All the parameters are concatenated into one string.
+
+- If there is only one string, the string itself is returned.
+
+- If any one of the strings is `NULL`, `NULL` is returned.
+
+### Syntax
+
+```bash
+concat(string1,string2,...)
+```
+
+### Examples
+
+```bash
+//This example concatenates 1, 2, and 3.
+nebula> RETURN concat("1","2","3") AS r;
++-------+
+| r     |
++-------+
+| "123" |
++-------+
+
+//In this example, one of the string is NULL.
+nebula> RETURN concat("1","2",NULL) AS r;
++----------+
+| r        |
++----------+
+| __NULL__ |
++----------+
+
+nebula> GO FROM "player100" over follow \
+        YIELD concat(follow._src, $^.player.age, $$.player.name, follow.degree) AS A;
++------------------------------+
+| A                            |
++------------------------------+
+| "player10042Tony Parker95"   |
++------------------------------+
+| "player10042Manu Ginobili95" |
++------------------------------+
+```
+
+## concat_ws() function
+
+The `concat_ws()` function connects two or more strings with a predefined separator.
+
+- If the separator is `NULL`, the `concat_ws()` function returns `NULL`.
+
+- If the separator is not `NULL` and there is only one string, the string itself is returned.
+
+- If the separator is not `NULL` and there is a `NULL` in the strings, `NULL` is ignored during the concatenation.
+
+### Syntax
+
+```bash
+concat_ws(separator,string1,string2,... )
+```
+
+### Examples
+
+```bash
+//This example concatenates a, b, and c with the separator +.
+nebula> RETURN concat_ws("+","a","b","c") AS r;
++---------+
+| r       |
++---------+
+| "a+b+c" |
++---------+
+
+//In this example, the separator is NULL.
+neubla> RETURN concat_ws(NULL,"a","b","c") AS r;
++----------+
+| r        |
++----------+
+| __NULL__ |
++----------+
+
+//In this example, the separator is + and there is a NULL in the strings.
+nebula> RETURN concat_ws("+","a",NULL,"b","c") AS r;
++---------+
+| r       |
++---------+
+| "a+b+c" |
++---------+
+
+//In this example, the separator is + and there is only one string.
+nebula> RETURN concat_ws("+","a") AS r;
++-----+
+| r   |
++-----+
+| "a" |
++-----+
+
+nebula> GO FROM "player100" over follow \
+        YIELD concat_ws(" ",follow._src, $^.player.age, $$.player.name, follow.degree) AS A;
++---------------------------------+
+| A                               |
++---------------------------------+
+| "player100 42 Tony Parker 95"   |
++---------------------------------+
+| "player100 42 Manu Ginobili 95" |
++---------------------------------+
+```
diff --git a/docs-2.0/3.ngql-guide/7.general-query-statements/6.show/19.show-meta-leader.md b/docs-2.0/3.ngql-guide/7.general-query-statements/6.show/19.show-meta-leader.md
new file mode 100644
index 00000000000..60f9afaad56
--- /dev/null
+++ b/docs-2.0/3.ngql-guide/7.general-query-statements/6.show/19.show-meta-leader.md
@@ -0,0 +1,27 @@
+# SHOW META LEADER
+
+The `SHOW META LEADER` statement shows the information of the leader in the current Meta cluster.
+
+For more information about the Meta service, see [Meta service](../../../1.introduction/3.nebula-graph-architecture/2.meta-service.md).
+
+## Syntax
+
+```ngql
+SHOW META LEADER;
+```
+
+## Example
+
+```ngql
+nebula> SHOW META LEADER;
++------------------+---------------------------+
+| Meta Leader      | secs from last heart beat |
++------------------+---------------------------+
+| "127.0.0.1:9559" | 3                         |
++------------------+---------------------------+
+```
+
+|Parameter|Description|
+|:---|:---|
+|`Meta Leader`|Shows the information of the leader in the Meta cluster, including the IP address and port of the server where the leader is located.|
+|`secs from last heart beat`|Indicates the time interval since the last heartbeat. This parameter is measured in seconds.|
diff --git a/docs-2.0/7.data-security/1.authentication/4.ldap.md b/docs-2.0/7.data-security/1.authentication/4.ldap.md
new file mode 100644
index 00000000000..05dcd06cf9d
--- /dev/null
+++ b/docs-2.0/7.data-security/1.authentication/4.ldap.md
@@ -0,0 +1,103 @@
+<!--
+# 使用OpenLDAP进行身份验证
+
+本文介绍如何将Nebula Graph连接到OpenLDAP服务器，使用OpenLDAP中定义的DN（Distinguished Name）和密码进行身份验证。
+
+!!! enterpriseonly
+
+    仅企业版支持本功能。
+
+## 认证方式
+
+启用OpenLDAP身份验证后，输入用户的账号和密码登录Nebula Graph时，Nebula Graph会在Meta服务中查找登录账号是否存在，如果账号存在，再根据认证方式去OpenLDAP中找到对应的DN，验证密码。
+
+OpenLDAP支持的认证方式有两种：简单绑定认证和搜索绑定认证。
+
+### 简单绑定认证（SimpleBindAuth）
+
+简单绑定认证会根据登录账号和Graph服务配置信息，拼接成OpenLDAP可以识别的DN，然后根据DN和密码，在OpenLDAP上进行验证。
+
+### 搜索绑定认证（SearchBindAuth）
+
+搜索绑定认证会读取Graph服务配置信息，查询配置信息中的`uid`和登录账号是否匹配，如果匹配，就读取这个DN，然后用DN和密码，在OpenLDAP上进行验证。
+
+## 前提条件
+
+- 已安装[OpenLDAP](https://www.openldap.org/)。
+
+- 已在OpenLDAP上导入用户的账号和密码信息。
+
+- OpenLDAP所在服务器已开放相应认证端口。
+
+## 操作步骤
+
+以OpenLDAP上已存在的账号`test2`、密码`passwdtest2`为例进行演示。
+
+1. [连接Nebula Graph](../../4.deployment-and-installation/connect-to-nebula-graph.md)，创建与OpenLDAP中对应的影子账号`test2`并授权。
+
+  ```ngql
+  nebula> CREATE USER test2 WITH PASSWORD '';
+  nebula> GRANT ROLE ADMIN ON basketballplayer TO test2;
+  ```
+
+    !!! note
+
+        Nebula Graph内创建用户时，密码可以任意设置。
+
+2. 编辑配置文件`nebula-graphd.conf`（默认目录为`/usr/local/nebula/etc/`）：
+
+  - 简单绑定认证（推荐）
+
+    ```bash
+    # 是否从配置文件获取配置信息。
+    --local_config=true
+    # 是否开启身份验证
+    --enable_authorize=true
+    # 身份验证方式：password、ldap、cloud
+    --auth_type=ldap
+    # OpenLDAP服务器地址
+    --ldap_server=192.168.8.211
+    # OpenLDAP服务器端口
+    --ldap_port=389
+    # OpenLDAP中的Schema名称
+    --ldap_scheme=ldap
+    # DN前缀
+    --ldap_prefix=uid=
+    # DN后缀
+    --ldap_suffix=,ou=it,dc=sys,dc=com
+    ```
+
+  - 搜索绑定认证
+
+    ```bash
+    # 是否从配置文件获取配置信息。
+    --local_config=true
+    # 是否开启身份验证
+    --enable_authorize=true
+    # 身份验证方式：password、ldap、cloud
+    --auth_type=ldap
+    # OpenLDAP服务器地址
+    --ldap_server=192.168.8.211
+    # OpenLDAP服务器端口
+    --ldap_port=389
+    # OpenLDAP中的Schema名称
+    --ldap_scheme=ldap
+    # 绑定目标对象的DN
+    --ldap_basedn=uid=test2,ou=it,dc=sys,dc=com
+    ```
+
+3. [重启Nebula Graph服务](../../4.deployment-and-installation/manage-service.md)，让新配置生效。
+
+4. 进行登录测试。
+
+  ```bash
+  $ ./nebula-console --addr 127.0.0.1 --port 9669 -u test2 -p passwdtest2
+  2021/09/08 03:49:39 [INFO] connection pool is initialized successfully
+
+  Welcome to Nebula Graph!
+  ```
+
+    !!! note
+
+        使用OpenLDAP进行身份验证后，本地用户（包括`root`）无法正常登录。
+-->
\ No newline at end of file
diff --git a/docs-2.0/8.service-tuning/improve-query-by-tag-index.md b/docs-2.0/8.service-tuning/improve-query-by-tag-index.md
new file mode 100644
index 00000000000..2fdfab05049
--- /dev/null
+++ b/docs-2.0/8.service-tuning/improve-query-by-tag-index.md
@@ -0,0 +1,53 @@
+<!-->
+# 增加和删除标签
+
+在openCypher中，有增加标签（`SET label`）和移除标签（`REMOVE label`）的功能，可以用于加速查询或者标记过程。
+
+在Nebula Graph中，可以通过Tag变相实现相同操作，创建Tag并将Tag插入到已有的点上，就可以根据Tag名称快速查找点，也可以通过`DELETE TAG`删除某些点上不再需要的Tag。
+
+!!! caution
+
+    请确保点上已经有另一个Tag，否则删除点上最后一个Tag时，会导致点也被删除。
+
+## 示例
+
+例如在basketballplayer数据集中，部分篮球运动员同时也是球队股东，可以为股东Tag`shareholder`创建索引，方便快速查找。如果不再是股东，可以通过`DELETE TAG`语句删除相应运动员的股东Tag。
+
+```ngql
+//创建股东Tag和索引
+nebula> CREATE TAG shareholder();
+nebula> CREATE TAG INDEX shareholder_tag on shareholder();
+//为点添加Tag
+nebula> INSERT VERTEX shareholder() VALUES "player100":();
+nebula> INSERT VERTEX shareholder() VALUES "player101":();
+//快速查询所有股东
+nebula> MATCH (v:shareholder) RETURN v;
++---------------------------------------------------------------------+
+| v                                                                   |
++---------------------------------------------------------------------+
+| ("player100" :player{age: 42, name: "Tim Duncan"} :shareholder{})  |
++---------------------------------------------------------------------+
+| ("player101" :player{age: 36, name: "Tony Parker"} :shareholder{}) |
++---------------------------------------------------------------------+
+nebula> LOOKUP ON shareholder;
++-------------+
+| VertexID    |
++-------------+
+| "player100" |
++-------------+
+| "player101" |
++-------------+
+//如果player100不再是股东
+nebula> DELETE TAG shareholder FROM "player100";
+nebula> LOOKUP ON shareholder;
++-------------+
+| VertexID    |
++-------------+
+| "player101" |
++-------------+
+```
+
+!!! note
+
+    如果插入测试数据后才创建索引，请用`REBUILD TAG INDEX <index_name_list>;`语句重建索引。
+-->
\ No newline at end of file
diff --git a/mkdocs.yml b/mkdocs.yml
index 1304afeafa6..0de87b5f4db 100755
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -162,6 +162,7 @@ nav:
           - collect(): 3.ngql-guide/6.functions-and-expressions/10.collect.md
           - reduce(): 3.ngql-guide/6.functions-and-expressions/11.reduce.md
           - hash(): 3.ngql-guide/6.functions-and-expressions/12.hash.md
+          - concat(): 3.ngql-guide/6.functions-and-expressions/13.concat.md
           - Predicate functions: 3.ngql-guide/6.functions-and-expressions/8.predicate.md
           - User-defined functions: 3.ngql-guide/6.functions-and-expressions/9.user-defined-functions.md
 
@@ -189,6 +190,7 @@ nav:
             - SHOW USERS: 3.ngql-guide/7.general-query-statements/6.show/16.show-users.md
             - SHOW SESSIONS: 3.ngql-guide/7.general-query-statements/6.show/17.show-sessions.md
             - SHOW QUERIES: 3.ngql-guide/7.general-query-statements/6.show/18.show-queries.md
+            - SHOW META LEADER: 3.ngql-guide/7.general-query-statements/6.show/19.show-meta-leader.md
 
       - Clauses and options:
           - GROUP BY: 3.ngql-guide/8.clauses-and-options/group-by.md
@@ -214,7 +216,7 @@ nav:
           - SHOW TAGS: 3.ngql-guide/10.tag-statements/4.show-tags.md
           - DESCRIBE TAG: 3.ngql-guide/10.tag-statements/5.describe-tag.md
           - DELETE TAG: 3.ngql-guide/10.tag-statements/6.delete-tag.md
-          
+
       - Edge type statements:
           - CREATE EDGE: 3.ngql-guide/11.edge-type-statements/1.create-edge.md
           - DROP EDGE: 3.ngql-guide/11.edge-type-statements/2.drop-edge.md
@@ -296,6 +298,7 @@ nav:
           - Authentication: 7.data-security/1.authentication/1.authentication.md
           - User management: 7.data-security/1.authentication/2.management-user.md
           - Roles and privileges: 7.data-security/1.authentication/3.role-list.md
+          - OpenLDAP authentication: 7.data-security/1.authentication/4.ldap.md
 #      - Backup & Restore:
 #          - What is Backup & Restore: 7.data-security/2.backup-restore/1.what-is-br.md
 #          - Compile BR: 7.data-security/2.backup-restore/2.compile-br.md
@@ -310,6 +313,7 @@ nav:
     - System design suggestions: 8.service-tuning/3.system-design.md
     - Execution plan: 8.service-tuning/4.plan.md
     - Processing super vertices: 8.service-tuning/super-node.md
+    - Add or delete tag: 8.service-tuning/improve-query-by-tag-index.md
 
   - Client:
     - Clients overview: 14.client/1.nebula-client.md

From f6b28fa16cfc9afaf088b26f1d6233c1f2df8331 Mon Sep 17 00:00:00 2001
From: "max.zhu@vesoft.com" <86282370+izhuxiaoqing@users.noreply.github.com>
Date: Tue, 14 Sep 2021 15:49:04 +0800
Subject: [PATCH 2/2] ldap and improve query by tag index (#711)

* ldap and improve query by tag index

* Update improve-query-by-tag-index.md

* Update 4.ldap.md
---
 .../1.authentication/4.ldap.md                | 80 +++++++++----------
 .../improve-query-by-tag-index.md             | 27 ++++---
 2 files changed, 53 insertions(+), 54 deletions(-)

diff --git a/docs-2.0/7.data-security/1.authentication/4.ldap.md b/docs-2.0/7.data-security/1.authentication/4.ldap.md
index 05dcd06cf9d..bdf721d3007 100644
--- a/docs-2.0/7.data-security/1.authentication/4.ldap.md
+++ b/docs-2.0/7.data-security/1.authentication/4.ldap.md
@@ -1,39 +1,38 @@
-<!--
-# 使用OpenLDAP进行身份验证
+# OpenLDAP authentication
 
-本文介绍如何将Nebula Graph连接到OpenLDAP服务器，使用OpenLDAP中定义的DN（Distinguished Name）和密码进行身份验证。
+This topic introduces how to connect Nebula Graph to the OpenLDAP server and use the DN (Distinguished Name) and password defined in OpenLDAP for authentication.
 
 !!! enterpriseonly
 
-    仅企业版支持本功能。
+    This feature is supported by the Enterprise Edition only.
 
-## 认证方式
+## Authentication method
 
-启用OpenLDAP身份验证后，输入用户的账号和密码登录Nebula Graph时，Nebula Graph会在Meta服务中查找登录账号是否存在，如果账号存在，再根据认证方式去OpenLDAP中找到对应的DN，验证密码。
+After the OpenLDAP authentication is enabled and users log into Nebula Graph with the account and password, Nebula Graph checks whether the login account exists in the Meta service. If the account exists, Nebula Graph finds the corresponding DN in OpenLDAP according to the authentication method and verifies the password.
 
-OpenLDAP支持的认证方式有两种：简单绑定认证和搜索绑定认证。
+OpenLDAP supports two authentication methods: simple bind authentication (SimpleBindAuth) and search bind authentication (SearchBindAuth).
 
-### 简单绑定认证（SimpleBindAuth）
+### SimpleBindAuth
 
-简单绑定认证会根据登录账号和Graph服务配置信息，拼接成OpenLDAP可以识别的DN，然后根据DN和密码，在OpenLDAP上进行验证。
+Simple bind authentication splices the login account and the configuration information of Graph services into a DN that can be recognized by OpenLDAP, and then authenticates on OpenLDAP based on the DN and password.
 
-### 搜索绑定认证（SearchBindAuth）
+### SearchBindAuth
 
-搜索绑定认证会读取Graph服务配置信息，查询配置信息中的`uid`和登录账号是否匹配，如果匹配，就读取这个DN，然后用DN和密码，在OpenLDAP上进行验证。
+Search bind authentication reads the Graph service configuration information and queries whether the `uid` in the configuration matches the login account. If they match, search bind authentication reads the DN, and then uses the DN and password to verify on OpenLDAP.
 
-## 前提条件
+## Prerequisites
 
-- 已安装[OpenLDAP](https://www.openldap.org/)。
+- [OpenLDAP](https://www.openldap.org/) is installed.
 
-- 已在OpenLDAP上导入用户的账号和密码信息。
+- The account and password are imported on OpenLDAP.
 
-- OpenLDAP所在服务器已开放相应认证端口。
+- The server where OpenLDAP is located has opened the corresponding authentication port.
 
-## 操作步骤
+## Procedures
 
-以OpenLDAP上已存在的账号`test2`、密码`passwdtest2`为例进行演示。
+Take the existing account `test2` and password `passwdtest2` on OpenLDAP as an example.
 
-1. [连接Nebula Graph](../../4.deployment-and-installation/connect-to-nebula-graph.md)，创建与OpenLDAP中对应的影子账号`test2`并授权。
+1. [Connect to Nebula Graph](../../4.deployment-and-installation/connect-to-nebula-graph.md), create and authorize the shadow account `test2` corresponding to OpenLDAP.
 
   ```ngql
   nebula> CREATE USER test2 WITH PASSWORD '';
@@ -42,53 +41,53 @@ OpenLDAP支持的认证方式有两种：简单绑定认证和搜索绑定认证
 
     !!! note
 
-        Nebula Graph内创建用户时，密码可以任意设置。
+        When creating an account in Nebula Graph, the password can be set arbitrarily.
 
-2. 编辑配置文件`nebula-graphd.conf`（默认目录为`/usr/local/nebula/etc/`）：
+2. Edit the configuration file `nebula-graphd.conf` (The default path is`/usr/local/nebula/etc/`):
 
-  - 简单绑定认证（推荐）
+  - SimpleBindAuth (Recommended)
 
     ```bash
-    # 是否从配置文件获取配置信息。
+    # Whether to get the configuration information from the configuration file.
     --local_config=true
-    # 是否开启身份验证
+    # Whether to enable authentication.
     --enable_authorize=true
-    # 身份验证方式：password、ldap、cloud
+    # Authentication methods include password, ldap, and cloud.
     --auth_type=ldap
-    # OpenLDAP服务器地址
+    # The address of the OpenLDAP server.
     --ldap_server=192.168.8.211
-    # OpenLDAP服务器端口
+    # The port of the OpenLDAP server.
     --ldap_port=389
-    # OpenLDAP中的Schema名称
+    # The name of the Schema in OpenLDAP.
     --ldap_scheme=ldap
-    # DN前缀
+    # The prefix of DN.
     --ldap_prefix=uid=
-    # DN后缀
+    # The suffix of DN.
     --ldap_suffix=,ou=it,dc=sys,dc=com
     ```
 
-  - 搜索绑定认证
+  - SearchBindAuth
 
     ```bash
-    # 是否从配置文件获取配置信息。
+    # Whether to get the configuration information from the configuration file.
     --local_config=true
-    # 是否开启身份验证
+    # Whether to enable authentication.
     --enable_authorize=true
-    # 身份验证方式：password、ldap、cloud
+    # Authentication methods include password, ldap, and cloud.
     --auth_type=ldap
-    # OpenLDAP服务器地址
+    # The address of the OpenLDAP server.
     --ldap_server=192.168.8.211
-    # OpenLDAP服务器端口
+    # The port of the OpenLDAP server.
     --ldap_port=389
-    # OpenLDAP中的Schema名称
+    # The name of the Schema in OpenLDAP.
     --ldap_scheme=ldap
-    # 绑定目标对象的DN
+    # The DN that binds the target.
     --ldap_basedn=uid=test2,ou=it,dc=sys,dc=com
     ```
 
-3. [重启Nebula Graph服务](../../4.deployment-and-installation/manage-service.md)，让新配置生效。
+3. [Restart Nebula Graph services](../../4.deployment-and-installation/manage-service.md) to make the new configuration valid.
 
-4. 进行登录测试。
+4. Run the login test.
 
   ```bash
   $ ./nebula-console --addr 127.0.0.1 --port 9669 -u test2 -p passwdtest2
@@ -99,5 +98,4 @@ OpenLDAP支持的认证方式有两种：简单绑定认证和搜索绑定认证
 
     !!! note
 
-        使用OpenLDAP进行身份验证后，本地用户（包括`root`）无法正常登录。
--->
\ No newline at end of file
+        After using OpenLDAP for authentication, local users (including `root`) cannot log in normally.
diff --git a/docs-2.0/8.service-tuning/improve-query-by-tag-index.md b/docs-2.0/8.service-tuning/improve-query-by-tag-index.md
index 2fdfab05049..e63ca267e59 100644
--- a/docs-2.0/8.service-tuning/improve-query-by-tag-index.md
+++ b/docs-2.0/8.service-tuning/improve-query-by-tag-index.md
@@ -1,26 +1,27 @@
-<!-->
-# 增加和删除标签
+# Add and delete tags
 
-在openCypher中，有增加标签（`SET label`）和移除标签（`REMOVE label`）的功能，可以用于加速查询或者标记过程。
+OpenCypher has the features of `SET label` and `REMOVE label` to speed up the process of querying or labeling.
 
-在Nebula Graph中，可以通过Tag变相实现相同操作，创建Tag并将Tag插入到已有的点上，就可以根据Tag名称快速查找点，也可以通过`DELETE TAG`删除某些点上不再需要的Tag。
+Nebula Graph achieves the same operations by creating and inserting tags to an existing vertex, which can quickly query vertices based on the tag name. Users can also run `DELETE TAG` to delete some vertices that are no longer needed.
 
 !!! caution
 
-    请确保点上已经有另一个Tag，否则删除点上最后一个Tag时，会导致点也被删除。
+    Make sure that there is another tag on the vertex. Otherwise, the vertex will be deleted when the last tag is deleted.
 
-## 示例
+## Examples
 
-例如在basketballplayer数据集中，部分篮球运动员同时也是球队股东，可以为股东Tag`shareholder`创建索引，方便快速查找。如果不再是股东，可以通过`DELETE TAG`语句删除相应运动员的股东Tag。
+For example, in the `basketballplayer` data set, some basketball players are also team shareholders. Users can create an index for the shareholder tag `shareholder` for quick search. If the player is no longer a shareholder, users can delete the shareholder tag of the corresponding player by `DELETE TAG`.
 
 ```ngql
-//创建股东Tag和索引
+//This example creates the shareholder tag and index.
 nebula> CREATE TAG shareholder();
 nebula> CREATE TAG INDEX shareholder_tag on shareholder();
-//为点添加Tag
+
+//This example adds a tag on the vertex.
 nebula> INSERT VERTEX shareholder() VALUES "player100":();
 nebula> INSERT VERTEX shareholder() VALUES "player101":();
-//快速查询所有股东
+
+//This example queries all the shareholders.
 nebula> MATCH (v:shareholder) RETURN v;
 +---------------------------------------------------------------------+
 | v                                                                   |
@@ -37,7 +38,8 @@ nebula> LOOKUP ON shareholder;
 +-------------+
 | "player101" |
 +-------------+
-//如果player100不再是股东
+
+//In this example, the "player100" is no longer a shareholder.
 nebula> DELETE TAG shareholder FROM "player100";
 nebula> LOOKUP ON shareholder;
 +-------------+
@@ -49,5 +51,4 @@ nebula> LOOKUP ON shareholder;
 
 !!! note
 
-    如果插入测试数据后才创建索引，请用`REBUILD TAG INDEX <index_name_list>;`语句重建索引。
--->
\ No newline at end of file
+    If the index is created after inserting the test data, use the `REBUILD TAG INDEX <index_name_list>;` statement to rebuild the index.