英语词汇voluntary certification怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	voluntary certification
释义	voluntary adj — 自愿的 adj • 志愿 adj voluntary — 义务 • 自行 • 随意 certification n — 证书 n • 证明 n • 鉴定 n voluntary n — 强制 n certify v — 核证 v certify — 签证
随便看	as a routine practice as arranged as art as art Director as articulated by as artificial as artwork as a rule as a rule it is as a rule of a thumb as a rule of thumb as a rule of thumb one can say as a rule thumb as a rule use asarum blumei asarum blumei asarum forbesii as a Russian citizen as ... as as as as ... as as ... as as a sacrifice for as a safeguard as a safeguard against

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voluntary adj —