Just before you crest a hill or reach the end of a speed interval, your lungs go into overdrive.

当你爬到山顶或即将到达最快速度之前，你的肺就会进入高速运转。

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Speed(S):the distance the crest moves forward per second.

速度（S）：每秒钟波峰移动的距离。

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Does not smoke the crowd lung function usually to achieve the crest in 15-25 years old, will drop in 35 year old of later lung function by certain speed, smoking acceleration lung function drop.

不吸烟人群肺功能通常在15 - 25岁达到顶峰，于35岁以后肺功能以一定速度下降，吸烟加速肺功能的下降。

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