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Sooner or later, almost everyone who travels by air—from occasional passengers to professional pilots—is affected by jet lag. One research study reported that as many as 94 percent of all long-distance fliers experience some form of jet lag. 从偶尔坐飞机的乘客到专业飞行人员，几乎每一个乘飞机旅行的人早晚都会被时差所影响。一项研究表明，在所有的长途飞行员中多达94%会经历某种形式的时差。 What is Jet Lag? 时差是什么？ Crossing multiple time zones tends to disrupt your circadian rhythms, confusing your natural 24-hour “body clock,”which regulates your waking and sleeping hours and keeps you aligned with your environment. 跨越多个时区会打乱你的生理节奏，扰乱你自身的24小时“生物钟”，这种生物钟调节你觉醒和睡眠时间，并让你与环境保持一致。 Symptoms of jet lag may include: 时差带来的晕机症状包括以下几点： Fatigue 疲劳 Insomnia 失眠 Disorientation 眩晕感 Swollen hands and feet 手脚肿胀 Headaches 头疼 Digestive problems 胃肠道症状 Lightheadedness 头晕 The symptoms of jet lag feel especially acute if you fly from west to east, because it is more difficult for your body to adjust to “losing time”when you journey east than to “gaining time”when you fly from east to west. | 
