英语词汇optional course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 course
释义	optional course conversationaladj. 谈话的,会话的健谈的,善于辞令的口语的,适... conceptionaladj. 想象的；理论的 operationalizevt. 使用于操作,使开始运转,实施
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