英语词汇direct nitration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	direct nitration
释义	direct nitration directionalityn. 方向性；定向性 unidirectionaladj. 单向的 contraindicationn. 〈医〉禁忌症候
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