During your exam period, you want your brain to work at its very best, so build in relaxation time before bed, avoid late night revision sessions and try to go to bed early so you get enough sleep.
在考试期间，你想让你的大脑处于最佳工作状态，所以在睡觉前安排放松时间，避免深夜复习，尽量早点睡觉，这样你就能得到足够的睡眠。
Sleep efficiency (the time spent asleep compared to time in bed), falls from its high values in youth (95%-98%) to 70%-80% in older age.
睡眠质量(睡眠时间与在床上的时间比)从年轻人的95% - 98%下降到老年人的70% - 80%。
In a few minutes' time we were stepping out sharply across the great cultivated plain or lake bed, framed like a vast emerald in its setting of frowning cliff.
几分种后，我们就轻快地行走在精耕细作、象翡翠一样镶嵌在起伏不平的峭壁间的平原或者也可以叫做湖床的上面了。
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