考研背诵50篇——49 Sleep
时间：2018-12-30 作者：英语课 分类：考研背诵50篇
Sleet 1 is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper 2, your sleep cycle is as follows. When you fist drift off into slumber 3, your eyes will roll about a bit, you temperature will drop slightly, your muscles will relax, and your breathing well slow and become quite regular. Your brain waves slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep. slower your brain waves will be. Then about 40to 69 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain will show the large slow waves that are known as the delta 4 rhythm. This is stage 4 sleep.
You do not remain at this deep fourth stage all night long, but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart 5 around under your closed eyelids 6 as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period, your body will soon relax again, your breathing will slip gently back from stage 1 to stage 4 sleep----only to rise once again to the surface of near consciousness some 80 minutes later.
- There was a great deal of sleet last night.昨夜雨夹雪下得真大。
- When winter comes,we get sleet and frost.冬天来到时我们这儿会有雨夹雪和霜冻。
- I usually go up to London on the sleeper. 我一般都乘卧车去伦敦。
- But first he explained that he was a very heavy sleeper. 但首先他解释说自己睡觉很沉。
- All the people in the hotels were wrapped in deep slumber.住在各旅馆里的人都已进入梦乡。
- Don't wake him from his slumber because he needs the rest.不要把他从睡眠中唤醒，因为他需要休息。
- He has been to the delta of the Nile.他曾去过尼罗河三角洲。
- The Nile divides at its mouth and forms a delta.尼罗河在河口分岔，形成了一个三角洲。
- The child made a sudden dart across the road.那小孩突然冲过马路。
- Markov died after being struck by a poison dart.马尔科夫身中毒镖而亡。