rotary       
 adjective uk/ˈrəʊ.tər.i/ us/ˈroʊ.t̬ɚ.i/
 (机器)有旋转部件的;旋转式的
(of a machine) having a part that moves around in a circle
  a rotary engine 旋转式发动机 
 rotary      
noun [ C ] US uk/ˈrəʊ.tər.i/ us/ˈroʊ.t̬ɚ.i/
 (同 traffic circle)
a  traffic circle