日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区

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





 
珍珠是怎樣養(yǎng)殖的?
[ 2006-12-22 11:39 ]

珍珠歷來(lái)受到人們的喜愛和贊賞,名貴的珍珠可以與最尊貴的寶石相提并論。光是漢語(yǔ)中和珍珠有關(guān)的詞匯就有很多,比如“珠圓玉潤(rùn)”,“玉貌珠顏”,“珠光寶氣”等等等等。天然珍珠的產(chǎn)量是十分稀少的,因此人們開創(chuàng)了養(yǎng)殖珍珠的方法。下面這篇短文將為您介紹珍珠是如何養(yǎng)殖的。

About 4,000 years ago the Chinese discovered pearls in oysters. The inside of an oyster's shell is covered with a smooth shiny coating called mother-of-pearl. When an irritant, such as a grain of sand, gets caught inside the oyster's shell it secretes layers of mother-of-pearl to protect its body by coating the irritant. The coated grain of sand becomes a pearl.

Man can force the oyster to produce a pearl by inserting an irritant into the shell. It takes the oyster two to three years to produce a good size pearl. Cultured pearls are usually not perfect, but the Japanese have discovered that if you surgically insert an irritant directly into the body of the oyster this will produce a perfect pearl.

Historically, pearl divers dove up to 80 feet with equipment no more sophisticated than nose clips. The divers could stay under water for about a minute and they scooped up the shells with their hands and put them in tubs that would float to the surface. The largest pearl ever found is reported to be four inches around and two inches long.

oysters: 牡蠣

irritant: 刺激物

(英語(yǔ)點(diǎn)津 Annabel 編輯)

 
 
相關(guān)文章 Related Stories
 
         
 
 
 
 
 
         
 
 

48小時(shí)內(nèi)最熱門

     

本頻道最新推薦

     
  Winter solstice(冬至)
  Picture time!
  電池是怎樣發(fā)電的?
  2006圣誕節(jié)特輯
  I believe I can fly!

論壇熱貼

     
  i want to have a english name
  “早生貴子”英語(yǔ)怎么說(shuō)
  日??谡Z(yǔ)趣味翻譯(It's fun!)
  how to say "彩鈴" in English?
  “天壤之別”英語(yǔ)怎么說(shuō)?
  翻譯:老鄉(xiāng)見老鄉(xiāng),兩眼淚汪汪




<strong id="xdwva"><div id="xdwva"></div></strong>
<label id="xdwva"></label>

<thead id="xdwva"></thead>
    <label id="xdwva"></label>

  1. 日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区 久久九九久精品国产日韩经典 国产国语国拍精品 啊v在线观看高清无码 视频一区二区欧美 久久精品爱爱唉爱