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exterior lines
outside connection
❶exterior line ❷outside (telephone)connections在拨～之前先按“0”please press the “0”button before dialing the outside number/～作战fight on exterior lines;exterior line operations
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。