英语词汇optional service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	optional service
释义	optional service operationalizevt. 使用于操作,使开始运转,实施 observationaladj. 根据观察的；监视的 improvisationaladj. 即兴的 professionalizevt. 使 ... 职业化；使 ... 专业化
随便看	Exstrophy of urinary bladder exstruct exstruction exstructive exstructor exsuccate exsuccation exsuccous exsuction Exsudate exsudatinite Exsudation exsudation cyst exsudation cyst of maxillofacial region exsudations Exsudative exsufflate exsufflation exsufflation with negative pressure exsufflator exsuit exsuits exsul exsula dentatrix albomaculata exsulcus

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