rotations
柯林斯詞典
1. N-VAR Rotation is circular movement. A rotation is the movement of something through one complete circle. 旋轉(zhuǎn); 轉(zhuǎn)動
...the daily rotation of the earth upon its axis. …地球圍繞地軸的每日自轉(zhuǎn)。
2. N-UNCOUNT 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. 輪流
He grew a different crop on the same field five years in a row, what researchers call crop rotation. 他連續(xù)5年在同一塊地上輪流種植不同作物，研究人員稱之為輪作。
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