purring

动词 purr:

1. make a soft swishing sound
   同义词：whizz, whiz, whirr, whir, birr, purr
2. indicate pleasure by purring; characteristic of cats
   同义词：purr, make vibrant sounds

1. The big car purred along the road.
   那辆大汽车一路呜呜地开了过去。