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.
除了普遍缺乏经验，他们也在学习如何使用大脑新的网络系统，紧张，疲劳，压力还是可能会使他们不知所措。
Along with lacking experience generally, they're still learning to use their brain's new networks. Stress, fatigue, or challenges can cause a misfire.
不知不觉中，眼睛会反复试图把焦点切换到屏幕后方的某个区域，以获得放松，而在屏幕和放松点之间的不停切换，会导致眼部疲劳。
Unconsciously, the eyes repeatedly attempt to rest by shifting their focus to an area behind the screen, and this constant switch between screen and relaxation point creates eyestrain and fatigue.
闲暇之余，我会看看花草放松心情，或听听音乐舒缓疲劳，但不知，我已很久没有爽朗的笑过了。
Leisure, I'll take a look at flowers and plants to relax, or listen to music relieve fatigue, but I don't know, I haven't a hearty laugh.
医生们不知道慢性疲劳综合症的致病原因。该病的特征是使人虚弱无力的疲倦、慢性疼痛，症状的轻重则可能随时间变化。
Doctors don't know what causes chronic fatigue syndrome, characterized by debilitating fatigue and chronic pain with symptoms that can wax and wane over time.
我不知道你有没有经历过，但是对于我来说这是非常使人疲劳的一件事。
I don't know whether you have this experience before, but I can tell you from my experience it was tiring.
我不知道你有没有经历过，但是对于我来说这是非常使人疲劳的一件事。
I don't know whether you have this experience before, but I can tell you from my experience it was tiring.
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