深度的睡眠表现为伴随着细微变化的非常均匀的呼吸，而REM睡眠(我们做梦时的睡眠模式)的呼吸模式则相对不稳定。
He explains that while deep sleep is characterized by very regular breathing with minimal variations, REM sleep (the phase during which we dream) has a much more erratic breathing pattern.
医学监护系统中为了更加直观的观察到病人的心跳、呼吸、血压等各种生理参数的变化情况，需要有相对应的波形显示。
In order to observe the changes of the patients ECG wave, breath, blood pressure, etc, it is important to show the waves of the physiological parameters in the medical monitoring system.
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