rotation

名词 rotation:

1. the act of rotating as if on an axis
   同义词：rotary motion
2. (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
3. a single complete turn (axial or orbital)
   同义词：revolution, gyration
4. a planned recurrent sequence (of crops or personnel etc.)

1. An instrument used to measure the rotation of the plane of polarization of polarized light passing through an optical structure or sample.
   偏振计; 旋光计用来测量经过光学结构或样品的极化光的偏振平面旋转的一种仪器
2. The chairmanship of the committee changes in rotation.
   委员会主席一职是轮流担任的。
3. The seasons follow each other in rotation.
   四季循环交替。
4. The rotation of crops keeps the soil healthy and fertile.
   谷物轮种使土壤保持了肥力和高质。

ro.ta.tion

n.Abbr. rot.（名词）缩写 rot.

The act or process of turning around a center or an axis:
旋转，转动：绕中心或轴转动的行为或过程：
例句：
the axial rotation of the earth.
地球绕轴自转

A single complete cycle of such motion.
旋转一圈
Mathematics A transformation of a coordinate system in which the new axes have a specified angular displacement from their original position while the origin remains fixed.
【数学】 旋度：一种坐标系的转变，新的坐标轴从原位置位移的一定角度而原点保持不变
Regular and uniform variation in a sequence or series:
轮换，轮作：在一个次序或序列中定期的变动：
例句：
a rotation of personnel; crop rotation.
员工的轮流替换；农作物的轮作

Games An order of shooting balls in billiards in which the ball with the lowest number on the table is always pocketed first.
【游戏】 轮番台球：台球游戏中击球的顺序，其中球桌上数码最小的球总是最先被击落袋中

【引伸】
rota.tional
adj.（形容词）