rotations

英 [rəʊˈteɪʃənz]

美 [roʊˈteɪʃənz]

n. 旋转; 转动; (旋转的)一周，一圈; 轮换; 交替; 换班
rotation的复数

柯林斯词典

N-VAR 旋转;转动
Rotationis circular movement. Arotationis the movement of something through one complete circle.
1. ...the daily rotation of the earth upon its axis.
  地球每天绕地轴自转
N-UNCOUNT 轮流;轮班
Therotationof 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 somethingin rotation, they take turns to do it.
1. 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。
2. Once a month we met for the whole day, and in rotation each one led the group.
  我们每个月聚在一起一整天，轮流担任领队。