名词
中文翻译：外部门
同义词：
['outer door', 'outer wall door']
例句：
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1.The external door is the first line of defense against intruders.
外部门是防止入侵者的第一道防线。
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2. The construction workers were busy installing the external door.
建筑工人正在忙着安装外部门。
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3. The company decided to replace the old external door with a new one.
公司决定用新的外部门替换旧的。