Prior studies reveal yawning leads to a heightened state of arousal, so a morning yawn may function somewhat like a cup of coffee in providing a jolt of energy.
先前的实验揭示呵欠可以产生一种加强的激励状态，所以早晨的一个呵欠也许就像一杯醒脑的咖啡那样提供少许的能量。
She was in a perpetual state of heightened arousal, hence the pacing, moaning, and inability to sleep.
她始终处于一种高度警醒的状态，因此她一直在踱步，悲泣，而无法入睡。
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