rotate           
verb uk/rəʊˈteɪt/ us/ˈroʊ.teɪt/
 [ I or T ](尤指围绕一个固定点)(使)旋转,(使)转动 
to turn or cause something to turn in a circle, especially around a fixed point
  Rotate the handle by 180° to open the door. 要想打开门,将把手旋转180度。 
 The wheel rotates around an axle. 轮子绕轮轴旋转。 
 The satellite slowly rotates as it circles the earth. 人造卫星围绕地球旋转的同时也在缓慢自转。 
  [ I or T ]轮流做;(由…)轮值;轮换 
If a job rotates or if a group of people rotate their jobs, the jobs are done at different times by different people.
  [ T ]轮作;换茬 
When farmers rotate crops, they regularly change which crops they grow in a particular field.