Update readme_cn.md

zhifu gao

2023-07-03 4a47e3b3dc0a1eeec17868763f9faae7da58bb4a

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# Contact
If you have any questions about M2MeT2.0 challenge, please contact us by
 
- email: [m2met.alimeeting@gmail.com](mailto:m2met.alimeeting@gmail.com)
 
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