n.旋转；循环
The rotation of the earth round the sun takes one year. 地球绕着太阳旋转要一年时间。
Walling under the rotation radius of crane boom is prohibited. 吊臂旋转半径下，禁止人行走。
The seasons follow each other in rotation. 四季循环交替。
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。
The chairmanship of the committee changes in rotation. 委员会主席一职是轮流担任的。
adj.回转的；轮流的
轮作方式
旋转不良
n.自动旋转(自旋)
n.正转
n.固有转动
