Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.

如果办公楼只有一个入口，在门上挂一块“请使用其他入口”标志。

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If you are having trouble, participation in office hours can only help your grade.

如果你有困难，在办公时间的参与只能对你的最终成绩有所帮助。

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If you are having trouble, participation in office hours can only help your grade.

如果你有困难，在办公时间的参与只能对你的最终成绩有所帮助。

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