由于睡眠时呼吸道中的气流阻力更大，并且用于呼吸的肌肉效率有变化，所以在睡眠时呼吸需要用两倍的力气。
It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing.
产品配备铝制蜂窝过滤器，气流阻力低，体积薄。
Products are configured with aluminum honeycomb and provide low resistance to airflow and thin profiles.
也许会减慢速度，因为上面的原因，在区域二中的减速是气流阻力。
That will probably also slow it down, because what causes, of course, this slowdown in regime two is really turbulence.
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