When something rotates or when you rotate it, it turns with a circular movement.
例句
The Earth rotates round the sun...地球围绕太阳转。Take each foot in both your hands and rotate it to loosen and relax the ankle.双手抓住自己的双脚，转动一下，以放松脚踝。
V-ERG
（使）轮流;（使）轮换
If people or things rotate, or if someone rotates them, they take it in turns to do a particular job or serve a particular purpose.
例句
The members of the club can rotate and one person can do all the preparation for the evening...俱乐部的成员可以轮流工作，而且一个人就能做好晚上的所有准备工作。They will swap posts in a year's time, according to new party rules which rotate the leadership.根据轮流担任领导的新政党章程，他们在一年后会轮换职位。