名词
中文翻译：主目录
同义词：
['main directory', 'main section']
例句：
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1. The main directory of the library is located on the first floor.
图书馆的主要目录位于一楼。
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2. The main section of the exhibition showcases the latest technology.
展览的主要部分展示了最新的技术。
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3. The main director of the company has been promoted to a higher position.
公司的主要负责人被提升到了更高的职位。