degradation failure退化: become vestigial; degenerate ...故障: hitch; breakdown; stoppage; ...退化故障率: degradation failure rate老化故障: degradation failure老化故障期: loss failure period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:退化故障,即可在微信中查询翻译