名词
中文翻译：封闭区域
同义词：
['closed space', 'enclosed area', 'sealed area']
例句：
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1. The factory is closed for maintenance.
工厂因维护而关闭。
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2. The park is a closed area with restricted access.
公园是一个封闭区域，限制出入。
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3. The ship was closed off from the outside world due to an emergency.
由于紧急情况，船只被封闭与外界隔绝。