optimum replacement rate最: most; best; worst; first; ve ...适: fit; suitable; proper更新: renew; replace; renovate; up ...率: rate; ratio; proportion更新率: rate of replacement; refresh rate; renewal rate; replacement rate; turnover rate下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:最适更新率，即可在微信中查询翻译
