名词短语
中文翻译：封闭的通风系统
同义词：
['closed air circulation system', 'closed-airventilation system']
例句：
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1. The hospital has a closed system ofventilation to ensure patient safety.
医院有一个封闭的通风系统，以确保患者安全。
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2. The new buildinguses a closed system of ventilation to reduce energy consumption.
新建筑使用一个封闭的通风系统来减少能源消耗。
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3. The closed system of ventilation is crucial for maintaining indoor air quality.
封闭的通风系统对于保持室内空气质量至关重要。