Merge 5.5.0 release to master

[taojintianxia]

Changes proposed in this pull request:

• Merge 5.5.0 release to master

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• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
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[taojintianxia]

for the following content, @zhaojinchao95 confirmed this should be merged to master