名词
中文翻译：封闭组
同义词：
['closed community', 'closed group', 'closed society']
例句：
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1. The closed group of employees has been working on a new project for months.
这个封闭的团队已经工作了几个月的新项目。
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2. The closed group was formed to protect the privacy of its members.
这个封闭的群体是为了保护其成员的隐私而成立的。
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3. The closed group is responsible for monitoring the security of the building.
这个封闭的群体负责监控建筑物的安全。