如果你累了或者是觉得状态下降了，可能就是到了你需要休息的时候了。
If you're tired and feeling down that may just mean that you need to take a break.
记住肌肉听从神经系统的指示，所以如果你大脑累了，你会觉得说不出的疲倦。
Remember the muscles respond to instructions from the nervous system so if your brain is tired you will suffer generalized tiredness.
你当时不让我来开车。如果我们轮流开车，你就不会觉得那么累了。
You didn't let me drive. If we had driven in turn, you wouldn't have got so tired.
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