英语词汇optional courses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 courses
释义	optional courses conversationalistn. 健谈的人 operationalizevt. 使用于操作,使开始运转,实施
随便看	tube center distance tube centrifuge tube characteristic tube checker tubecidin tube clamp tube clamping forceps tube clamp in valve tube clampin valve tube classifier tube cleaner Tube cleaning tube cleaning tool Tube Clematis Herb tube clematis root or stem Tube clip tube clipper tube closing tube closing machine tube closure Tubeco tube coefficient tube cofficients tube coil tube coil cylinder

英汉双解词典包含3607232条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。