如果你认为周末待在床上可以弥补你一个星期所失去的睡眠，那么再考虑一下。
If you think staying in bed on the weekends will make up for a weeks' worth of sleep deprivation, think again.
他们认为应该睡8或9个小时，应此一定要花这么久的时间待在床上，这样的结果是很难进入梦乡或者是半夜就醒了。
They think they should sleep 8 or 9 hr., so they spend [that amount of time] in bed, with the result that they have trouble falling asleep and wake up a lot during the night.
考试期间，我们轮流给室友带饭，没轮到的同学就可以整天待在床上，伏在折叠桌复习看书了。
During exams, we took turns to buy meals for our fellow roommates. Those who were not on duty could remain in bed and study all day with their books propped up on their folding desk.
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