"换气"是个多义词，它可以指换气（京剧演唱方法之一）,换气（岑宁儿演唱歌曲）。
恐惧中的人可能会每分钟呼吸30次。这是“换气过度”。
Someone panicking can take as many as 30 breaths a minute. This is “hyperventilation”.
通风换气可以降低密闭空间内的污染物水平，研究者们如是说。
Ventilation can help reduce the level of pollutants in closed rooms, the researchers said.
人们往往会屏住呼吸，或吸入过多的氧气或换气过度。
People often hold their breath, or take in too much oxygen and hyperventilate.
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