英語聽力 學(xué)英語,練聽力,上聽力課堂! 注冊 登錄
> 在線聽力 > 有聲讀物 > 英語雜志 > 英語聽力文摘 >  第329篇

英語聽力文摘 手繭如何形成?

所屬教程:英語聽力文摘

瀏覽:

手機(jī)版
掃描二維碼方便學(xué)習(xí)和分享
https://online2.tingclass.net/lesson/shi0529/0007/7643/314.mp3
https://image.tingclass.net/statics/js/2012
What Are Calluses And How Are They Formed?

皮膚上的繭是如何形成的?

人體皮膚由于勞動過程長期摩擦造成皮膚表皮細(xì)胞壞死而形成的,主要出現(xiàn)于手掌、足掌等部位。長時間的受到磨檫,組織細(xì)胞的老死,角質(zhì)層的嚴(yán)重受損形成手繭.

Most of us are familiar with calluses.

These extra-tough patches of skin are generally quite useful–we might even say handy–because they act like a kind of natural armor, protecting areas of skin that get an unusual amount of wear and tear. Have you ever wondered exactly what a callus is, or how it forms on your skin?

Callus formation is triggered by pressure or abrasion. The heel of your foot as it rubs inside your shoe, or the palm of your hand if you’re doing a lot of manual labor are good examples of this.

While it might feel like a callus is something extra, added to your skin, it’s actually just a build-up of what’s already there.

Here’s How It Works

Your skin has a number of layers of different types of cells.

The outermost is a layer of hardened, dead cells. This top layer is usually about twenty-five cells thick, and it constantly replaces itself as the outermost cells flake off to be replaced by new hardened, dead cells underneath.

All About Friction

If your skin is subject to an unusual amount of friction, this layer of dead cells increases. New dead cells are added faster than the old ones slough away. This can build up the outer layer from twenty-five cells thick to over a hundred cells thick. You’ve grown a callus.

While calluses are generally useful, if the process continues unchecked a callus can thicken into a cone-shaped structure called a corn. These super calluses can be quite painful, and may require the attention of a doctor.

譯文

對于“老繭”,我們都很熟悉。

這些皮膚上突出的硬皮是很有用的,也可以說是方便,因為他們扮演著保護(hù)常磨損皮膚的天然盔甲的角色。你是否思考過什么是老繭?他又是怎樣形成的?

老繭是由壓力和摩擦而形成。腳后跟的繭是由其在鞋里摩擦而形成,正如手繭是在大量的勞動過程中形成。

盡管看起來似乎是皮膚上多出的部分,然而事實是已經(jīng)存在的皮膚角質(zhì)的累積。

形成過程

皮膚是由若干層不同類型的皮膚構(gòu)成。

表層是一些壞死的硬細(xì)胞,通常有25個細(xì)胞那么厚,表層細(xì)胞不斷的脫落,取而代之的是下層硬的壞死細(xì)胞,由此而完成自我更替過程。

一切皆由摩擦引起

假如皮膚受到不尋常量的摩擦,這層壞死細(xì)胞將會增加,新的壞死細(xì)胞增長速度比舊細(xì)胞脫落的速度快,這就致使皮膚表層的厚度增加到100個細(xì)胞那么厚,由此,老繭便形成。

雖然一般來講,繭是有益的,但如不控制其過程,老繭厚度就會增加到被稱作雞眼的錐形結(jié)構(gòu),那樣就會很疼,甚至需要去看醫(yī)生。

用戶搜索

瘋狂英語 英語語法 新概念英語 走遍美國 四級聽力 英語音標(biāo) 英語入門 發(fā)音 美語 四級 新東方 七年級 賴世雄 zero是什么意思西安市鴻雁社區(qū)英語學(xué)習(xí)交流群

網(wǎng)站推薦

英語翻譯英語應(yīng)急口語8000句聽歌學(xué)英語英語學(xué)習(xí)方法

  • 頻道推薦
  • |
  • 全站推薦
  • 推薦下載
  • 網(wǎng)站推薦