HSK 7-9
轮换
lúnhuàn动
to rotate; to take turns
医护人员每四小时轮换一次。
Yīhùrényuán měisì xiǎoshí lúnhuàn yícì.
The medical staff rotate every four hours.
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Appears across levels (7-9) in the HSK 3.0 word list.