2N-UNCOUNT [oft inNOUN]轮流;轮班 The rotation of a group of things or people is the fact of them taking turns to do a particular job or serve a particular purpose. If people do something in rotation, they take turns to do it. 轮流;轮班
He grew a different crop on the same field five years in a row, what researchers call crop rotation.
他连续5年在同一块地里种植不同的作物,研究人员称之为轮作。
Once a month we met for the whole day, and in rotation each one led the group.