We need 7-8 hours of sleep to be fully rested.
我们每天需要7到8小时的睡眠时间。
Be careful about driving or operating machinery when not fully rested, though.
当你没有得到充足休息时，驾驶或者操作机器一定要非常小心。
In the morning when you are fully rested your best will be better than after you have worked a full day.
清晨时的状态，因为得到了充分的休息，它将比劳累了一整天工作后的傍晚有更好的表现。
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