如果你问一位跑完19英里的马拉松运动员感觉如何，他会说累的。
If you ask a marathon runner how he feels after 19 miles, he will say he is tired.
关于唐感觉有多累这件事，如果你曾经依赖过一个医生或是一个飞行员，你就会知道他说没说真话有多危险。
If you've ever relied on a doctor or an airplane pilot, then you know there's a lot at stake over whether Don is telling the truth about how tired he feels.
克拉科夫说：如果当你感觉仅仅有点累的时候就上床睡觉的话，你很有可能不能入睡。
If you go to bed when you're just tired, you probably won't be able to fall asleep, Krakow says.
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