名词短语
中文翻译：向下通风系统
同义词：
['downwind system', 'downdraft system']
例句：
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1.The building has a downward system of ventilation that helps to keep the air fresh.
这座建筑有一个向下通风系统，有助于保持空气新鲜。
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2. In the event of a fire, the downward system of ventilation is essential for maintaining a safe environment.
在发生火灾的情况下，向下通风系统对于维持安全环境至关重要。
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3. The engineers designed the downdraft system to improve the efficiency of the exhaust fans.
工程师们设计了下风道系统来提高排气风扇的效率。