英语词汇“optional retention”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	optional retention
释义	optional retention 选择保持
随便看	working scientists and technicians working score working screen Workings deformation law working room working rope working rote working round work in groups working route working routine working routine check working routine library working routine package working routs working RUBBER working rule Working-rule working rules working run workings working safety sense working sail working sails working sample