他的双手由于多年的空手道练习，粗糙而布满老茧。
His hands were rough and callused, from years of karate practice.
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.
他们提道，由于灯光让雄鸟睡眠少了，所以它们身体更加虚弱。
They note that the males may be weaker, because they get less sleep due to the lights.
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