他们每月轮换值班表以确保公平分配。
They ___rotate the duty schedule every month to ensure fair distribution.
我们班实行轮值制度，每周换一名值日生。
Our class has a ___rotating duty system where a different student is assigned each week.
风扇的叶片每分钟旋转200次。
The blades of the fan ___rotate 200 times per minute.
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