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我们图书馆有一项规定：借书前要保持双手干净。
Our library has a provision that hands must be clean before books are taken out.
youdao
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双手、工作台和工具都应该保持干净。
Your hands, the workbench, and the tools should be clean.
youdao
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双手、工作台和工具都应该保持干净。
Your hands, the workbench, and the tools should be clean.
youdao