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You must know the lab rules before the first lab lessons.
在上第一堂实验课之前，你必须了解实验规则。
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The lab staff shall keep the lab clean according to the lab rules and regulations.
实验人员须按实验室规章制度做好实验室清洁工作。
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The lab staff shall keep the lab clean according to the lab rules and regulations.
实验人员须按实验室规章制度做好实验室清洁工作。
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