英语词汇directional sign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	directional sign
释义	directional sign directionalityn. 方向性；定向性 unidirectionaladj. 单向的 bidirectionaladj. 双向的；双向作用的 Congregationalist公理 Congregationalist公理
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