Update readme_cn.md

zhifu gao

2023-07-03 4a47e3b3dc0a1eeec17868763f9faae7da58bb4a

 .github/workflows/UnitTest.yml

@@ -19,6 +19,12 @@
        python-version: ["3.7"]

    steps:
      - name: Remove unnecessary files
        run:
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf "/usr/local/share/boost"
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
      - uses: actions/checkout@v3
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v4