Naiyuan Liu c6fbf3d966 Update preparation.md %!s(int64=4) %!d(string=hai) anos
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preparation.md c6fbf3d966 Update preparation.md %!s(int64=4) %!d(string=hai) anos
usage.md c42cbf1b38 Update usage.md %!s(int64=4) %!d(string=hai) anos