几乎每天，打瞌睡的人会犯数学错误，打坏东西，或向家人、朋友和同事发火。
On an everyday level, sleepy people make math errors, break things and become cross with their families, friends and co-workers.
这里需要提醒那些在化学课上打瞌睡的人，滴定法是计算溶液中物质浓度的一种方法。
Titration, to remind those who dozed through their chemistry lessons, is a way of working out the concentration of a substance in a solution.
鼾声大，入睡困难，或者醒来后经常感觉疲劳的人，可能要担心比工作时打瞌睡更严重的问题。
People who snore loudly, have difficulty falling asleep, or often wake up feeling tired may have more to worry about than dozing off at work.
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