商业是出乎意料地自信的，庄重的，灵敏的，进取的，而且不知疲劳的。
Commerce is unexpectedly confident and serene, alert, adventurous, and unwearied.
可能是因为疲劳，她在比赛中的错误率不知不觉地升高了。
An increasing ratio of mistakes, perhaps induced by tiredness, crept into her game.
尽管如此，大部分的驾驶员根本不知道隔多久休息一下能预防疲劳，以及开车时睡着了该怎么办。
Despite this, most drivers simply don't know how often they should take rest breaks to help prevent tiredness, and what to do if they get sleepy behind the wheel.
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