这话什么意思呢？英语高手进It tales twice as much effort to breathe during
这话什么意思呢？英语高手进
It tales twice as much effort to breathe duringsleep because of greater resistance toairflow in the airwaysand changes in the efficiency of the muscles used for breathing.
It tales twice as much effort to breathe duringsleep because of greater resistance toairflow in the airwaysand changes in the efficiency of the muscles used for breathing.
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