考研優(yōu)美英語(yǔ)作文的背誦049
Sleep
Sleep is part of a persons daily activity cycle. There are severaldifferent stages of sleep, and they too occur in cycles. If you are anaverage sleeper, your sleep cycle is as follows. When you first drift off intoslumber, your eyes will roll about a bit, your temperature will dropslightly, your muscles will relax, and your breathing well slow andbecome quite regular. Your brain waves slow down a bit too, with thealpha rhythm of rather fast waves predominating for the first few minutes.This is called stage 1 sleep. For the next half hour or so, as you relaxmore and more, you will drift down through stage 2 and stage 3 sleep. The loweryour stage of sleep, the slower your brain waves will be. Then about 40 to 60minutes after you lose consciousness you will have reached the deepest sleep ofall. Your brain waves will show the large slow waves that are known as the deltarhythm. This is stage 4 sleep.You do not remain at this deep fourth stageall night long, but instead about 80 minutes after you fall into slumber,your brain activity level will increase again slightly. The delta rhythm willdisappear, to be replaced by the activity pattern of brainwaves. Your eyes will begin to dart around under your closed eyelids asif you were looking at something occurring in front of you. This period ofrapid 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 breathingwill grow slow and regular once more, and you will slip gently back fromstage 1 to stage 4 sleep - only to rise once again to the surface of nearconsciousness some 80 minutes later.
全文翻譯：睡眠
睡眠是人每天日常活動(dòng)循環(huán)的一部分。人的睡眠分幾個(gè)階段，而這些階段也是循環(huán)發(fā)生的。 如果你是一個(gè)正常的睡眠者，你的睡眠循環(huán)會(huì)這樣進(jìn)行。在你開(kāi)始昏昏入睡時(shí)，你 的眼睛會(huì)滾動(dòng)幾下，體溫略有下降，肌肉放松，呼吸變得緩慢而有節(jié)奏。除了開(kāi)始幾分鐘比較快的節(jié)奏外，腦電波也稍有減緩。這被稱(chēng)為第一階段睡眠。在隨后約半小時(shí)內(nèi)，你 進(jìn)一步放松，進(jìn)入第二和第三階段睡眠。 睡眠越深入，腦電波就越緩慢。大約在開(kāi)始睡眠 后的 40 到 60 分鐘，你將進(jìn)入沉睡狀態(tài)。 這時(shí)的腦電波表現(xiàn)為巨大的緩波，被稱(chēng)為節(jié)奏。 這就是第四階段睡眠。但你并不是整夜都保持這種沉睡狀態(tài)。入睡后約 80 分鐘左右，你 的大腦運(yùn)動(dòng)水平會(huì)再度略有提高。節(jié)奏消失，并被腦電波的運(yùn)動(dòng)圖形取代。 你的眼睛會(huì)在閉著的眼瞼下迅速轉(zhuǎn)動(dòng)，就好象你在看著眼前發(fā)生的什么事情。這種迅速的眼球運(yùn)動(dòng)持 續(xù)約 8～15 分鐘，這一階段睡眠被稱(chēng)之為快速眼動(dòng)睡眠。在 REM 睡眠階段，你的肢 體會(huì)很快再度放松，呼吸也再次放慢并變得有節(jié)奏，你會(huì)輕松地從第一階段滑入第四階段睡 眠-直到大約 80 分鐘后重新接近清醒狀態(tài)。
Sleep
Sleep is part of a persons daily activity cycle. There are severaldifferent stages of sleep, and they too occur in cycles. If you are anaverage sleeper, your sleep cycle is as follows. When you first drift off intoslumber, your eyes will roll about a bit, your temperature will dropslightly, your muscles will relax, and your breathing well slow andbecome quite regular. Your brain waves slow down a bit too, with thealpha rhythm of rather fast waves predominating for the first few minutes.This is called stage 1 sleep. For the next half hour or so, as you relaxmore and more, you will drift down through stage 2 and stage 3 sleep. The loweryour stage of sleep, the slower your brain waves will be. Then about 40 to 60minutes after you lose consciousness you will have reached the deepest sleep ofall. Your brain waves will show the large slow waves that are known as the deltarhythm. This is stage 4 sleep.You do not remain at this deep fourth stageall night long, but instead about 80 minutes after you fall into slumber,your brain activity level will increase again slightly. The delta rhythm willdisappear, to be replaced by the activity pattern of brainwaves. Your eyes will begin to dart around under your closed eyelids asif you were looking at something occurring in front of you. This period ofrapid 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 breathingwill grow slow and regular once more, and you will slip gently back fromstage 1 to stage 4 sleep - only to rise once again to the surface of nearconsciousness some 80 minutes later.
全文翻譯：睡眠
睡眠是人每天日常活動(dòng)循環(huán)的一部分。人的睡眠分幾個(gè)階段，而這些階段也是循環(huán)發(fā)生的。 如果你是一個(gè)正常的睡眠者，你的睡眠循環(huán)會(huì)這樣進(jìn)行。在你開(kāi)始昏昏入睡時(shí)，你 的眼睛會(huì)滾動(dòng)幾下，體溫略有下降，肌肉放松，呼吸變得緩慢而有節(jié)奏。除了開(kāi)始幾分鐘比較快的節(jié)奏外，腦電波也稍有減緩。這被稱(chēng)為第一階段睡眠。在隨后約半小時(shí)內(nèi)，你 進(jìn)一步放松，進(jìn)入第二和第三階段睡眠。 睡眠越深入，腦電波就越緩慢。大約在開(kāi)始睡眠 后的 40 到 60 分鐘，你將進(jìn)入沉睡狀態(tài)。 這時(shí)的腦電波表現(xiàn)為巨大的緩波，被稱(chēng)為節(jié)奏。 這就是第四階段睡眠。但你并不是整夜都保持這種沉睡狀態(tài)。入睡后約 80 分鐘左右，你 的大腦運(yùn)動(dòng)水平會(huì)再度略有提高。節(jié)奏消失，并被腦電波的運(yùn)動(dòng)圖形取代。 你的眼睛會(huì)在閉著的眼瞼下迅速轉(zhuǎn)動(dòng)，就好象你在看著眼前發(fā)生的什么事情。這種迅速的眼球運(yùn)動(dòng)持 續(xù)約 8～15 分鐘，這一階段睡眠被稱(chēng)之為快速眼動(dòng)睡眠。在 REM 睡眠階段，你的肢 體會(huì)很快再度放松，呼吸也再次放慢并變得有節(jié)奏，你會(huì)輕松地從第一階段滑入第四階段睡 眠-直到大約 80 分鐘后重新接近清醒狀態(tài)。
