maintenance renewal rates维护: safeguard; defend; uphold; k ...更新: renew; replace; renovate; up ...率: rate; ratio; proportion更新率: rate of replacement; refresh rate; renewal rate; replacement rate; turnover rate分次更新率: fractional 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:维护更新率，即可在微信中查询翻译
