rpm / ˌɑːpiːˈɛm/ (also r.p.m.)

• 1. 

  rpm is used to indicate the speed of something by saying how many times per minute it will go around in a circle. rpm is an abbreviation for "revolutions per minute." 每分钟转速; revolutions per minute的缩写

  例：

  Both engines were running at 2,500 rpm.

  两个引擎的转速都是每分钟2,500转。