名词
中文翻译：Unknown
同义词：
['down draft', 'downflow', 'downdraft']
例句：
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1. The air conditioner has a down draught that keeps the room cool.
空调有一个向下的气流，使房间保持凉爽。
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2. Downdraughts are caused by the movement of air in a room or building.
下风道是由房间或建筑内空气流动引起的。
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3. Downdraughts can be dangerous if they are not properly controlled.
如果不加以控制，下风道可能会很危险。