Rotation is circular movement. A rotation is the movement of something through one complete circle.
近义词
revolution , gyration , spinning
双语例句
例：
the daily rotation of the earth upon its axis.
地球围绕地轴的每日自转。
例：
the point of rotation of the lever arms.
杠杆的旋转点。
2.?[U 不可数名词] 轮流
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.
双语例句
例：
He grew a different crop on the same field five years in a row, what researchers call crop rotation.