英語聽力文摘 為尿床平反
尿床的困擾
Never a happy topic, bed wetting is a very distressing problem for five to seven million American kids. If we can’t explain why some people like to pick on these kids, can we at least shed some light on what causes bed wetting?
At one time, people punished bed-wetters for acting badly, but today scientists believe that this condition has several physical causes. Some kids suffer from problems like infections or anatomicaldefects that can be easily identified and treated.
Other causes are harder to pin down. One promising area of research is on the kidneyhormoneADH. We all produce more ADHhormone at night. ADH signals the kidney to slow down production. This is why we don’t go to the bathroom for eight hours at night but could never last that long between bathroom breaks during the day. Some children who wet their beds do not produce enough ADH at night. When given drugs that boost this hormone, they stop bed wetting.
Finally, some kids simply have small bladders and an undeveloped nervous system. The good news is that these kids, like most bedwetters, will grow out of it as their bodies develop and mature.
尿床可是個不愉快的話題。尿床困擾著500萬至700萬名美國兒童。如果我們無法解釋為什么偏偏這些兒童尿床，那么我們至少探究下尿床的原因吧!
以前，經(jīng)常尿床的兒童會被罰。但是，如今科學家相信尿床是基于生理因素。一些兒童患常見可治愈傳染病或結構缺陷。
其它原因就很難下定論了。有種可行性研究的方向是腎臟激素：抗利尿激素。夜晚人體分泌的抗利尿激素較多?？估蚣に叵蚰I臟發(fā)出減慢新陳代謝的信號。這是為什么我們夜晚八小時不上廁所，但是白天上廁所的間隔時間卻更短。一些兒童尿床是因為夜晚沒有分泌足夠的抗利尿激素。服用藥物促進抗利尿激素分泌就可以治療兒童尿床。
另外，有些兒童尿床僅僅是因為膀胱小且神經(jīng)系統(tǒng)發(fā)育不完善。可喜的是隨著身體機能的發(fā)育和成熟，大多數(shù)尿床兒童不再尿床。
bed wetting:尿床
pin down：確定
grow out of ：戒除
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