黄色大片影院视频免费,在线观看视频日韩,天天操天天操天天干,久久青青91费线频观青

您現(xiàn)在的位置: Language Tips> Easy English> Odd Question  
 





 
指甲是怎么生長的
[ 2007-07-20 13:47 ]

指甲是塑造美女必不可少的一部分。想要擁有美麗的指甲,先得來了解指甲的生長原理。

Fingernails and toenails grow from a point near the roots below the skin, at the base of the nail where the nail is very thin. White in color, and half-moon in shape, this semi-circle is appropriately named the "lunula, " and comprises a group of cells that manufacturekeratin, a dead, hoof-like protein. The keratin like protein produced, gathers and merges with the nail plate, the dead armor that protects the soft and tender nail bed underneath, and pushes the entire nail up and out. Though the fingernails and toenails grow an average of two inches per year, their growth slows with age, and the average adult's fingernails grow only one inch over the course of eight months.

The base of the fingernails and toenails, as well as some of the nail along both sides of the nail, are embedded into the skin. Unlike other skin, this skin contains elastic fibers that connect it to the fingernail or toenail, and hold it firmly in place. Thecuticle, a rim of skin over the lunula, protects it from bacterial infection, serves as a shock absorber, and shields the nail from any sudden impacts.

Though many consider dressing the fingernails up to go out a statement of beauty, or one of vanity, they serve those in the medical field as a diagnostic tool. Normally, the lunula, or half-moon, is white in color, indicating proper nutrition and good overall health. Blue lunula raise red flags that circulatory problems to the fingers may exist. Nails that are hard,brittle, and tend to split easily, may also be clues to poor circulation, infection, or disturbances of theglandularand nutritional systems.


Further nails that curl sharply around the finger point tocoronary, liver, or lung diseases. Nails that are sunken in appearance often indicateanemia, a condition where an insufficient amount of oxygen is carried by the blood.

lunula: 指甲下端的白色弧影,甲弧影
keratin: 角蛋白,角質(zhì)
cuticle: 角質(zhì)層
brittle: 硬而脆的
glandular: 腺的
coronary: 冠狀動脈
anemia: 貧血癥

(來源:coolquiz.com 英語點津 Annabel 編輯)

我想了解更多趣味百科知識

 
 
相關(guān)文章 Related Stories
 
         
 
 
 
 
 
         
 
 

48小時內(nèi)最熱門

     
  女孩的心思誰能猜:Suspended from class
  各種各樣的“錢”
  “搶鏡頭”怎么說
  姚明婚后打算:備戰(zhàn)奧運第一

本頻道最新推薦

     
  為什么畢業(yè)時要穿學(xué)位服
  We cats can use chopsticks, too!
  不受歡迎的夜半歌聲:打鼾
  US Independence Day(美國國慶日)
  Exercise after dinner

論壇熱貼

     
  “低生育,素質(zhì)好,男女都是寶”,怎么譯為好?請教高手!
  請問“老鄉(xiāng)”這個詞怎么翻譯?
  C-E: how to say "路盲"?
  各位,“相親”英語怎么說?
  指紋上的ridges and loops是什么意思?
  請教一下 餃子的“餡” 用English怎么說啊