Revolution Per Minute ,每分...转
/,ɑ: pi: 'em; ,ɑr pi `ɛm/
abbr 缩写 = revolutions per minute (esp as a measure of engine speed) 每分钟的转数（尤指发动机的）:
2500 rpm 2500转/分.
revolutions per minute
used to describe the speed at which something turns, especially an engine or a record player