英语词汇optional clause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 clause
释义	optional clause conceptionaladj. 想象的；理论的 presentationaladj. 直觉的(上演的) operationalizevt. 使用于操作,使开始运转,实施
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