pulsating rate of revolutionspeed fluctuation rate转速: speed; revolution; rotation ...波动: undulate; fluctuate; unsettl ...率: rate; ratio; proportion转速波动: fluctuation of speed; revolution fluctuation; speed fluctuation波动率: fluctuating ratio; fluctuation rate; fluctuation ratio; pulsating rate; volatility下载手机词典可随时随地查词查翻译