名词
中文翻译：循环通风口
同义词：
['vent', 'air vent', 'exhaust duct']
例句：
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1. The loop vent is designed to preventdust from entering the room.
这个循环通风口的设计是为了防止灰尘进入房间。
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2. The ventilation system needs to be regularly cleanedto maintain proper air circulation.
通风系统需要定期清洁，以保持适当的空气流通。
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3. Theexhaust duct is used to direct hotair away from the building.
排气管用于将热空气从建筑物中排出。