国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

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





 
What is rubber?
[ 2006-05-19 10:29 ]

Rubber is a sticky, elastic solid produced from a milky liquid called "latex," which has different properties than thesapfound in trees. Although latex is found in the bark, roots, and stems, branches, leaves, and fruit of over 400 different plants and trees, the bulk is found, andextracted, from the inner bark of the branches, and from the trunk, of the rubber tree. Quite simply, it would not be cost-effective to extract the latex from rubber producing plants, such as thedandelion, themilkweed, and thesagebrush. Just visualize some poor soul laboring over one of these with asyringe!

Rubber, derived from thegumof a tree, has existed sinceprehistorictimes. For example, fossils of rubber-producing plants date back almost 3,000,000 years.Crude rubberballs, discovered in ruins of ancientIncan and Mayan civilizationsin Central and in South America, are, at very least, 900 years old. Natives of Southeastern Asia used rubber, prepared from the "juice" of trees to waterproof their baskets and jars. Even Columbus, on his second voyage to the New World, observed Haitian natives playing with balls made from "the gum of a tree."

Latex consists of tiny particles of liquid, solid, orsemi-fluidmaterial, that appears in the form of a watery liquor, not to be drunk! Thebreakdownon this watery liquid is only about 33% rubber, with the remainder being, not surprisingly, water! When the rubber particles in the latex join together, they form a ball of rubber.

Rubber producing plants grow best within 10 degrees of the Equator, where the climate is hot and moist, and the soil is deep and rich. For this reason, the area of about 700 miles on each side of the Equator is known as the "Rubber Belt." Brazil, from whence the best, and top-producing rubber tree hails, is firmly planted within the Rubber Belt. This Latino tree with a Latin name,Hevea brasiliensis, produces approximately 96% of the world's supply of natural rubber, and now is cultivated in other Rubber Belt countries.

Most likely, the French, prior to the 1800s, were the first white men to take advantage of rubbers' elasticity. They manufactured "rubber bands" for use with their garters and their suspenders, to help to keep their pants up. Rubber belts did not exist at that time.

 

note:

latex: 膠乳,乳液
sap: 樹液,汁液


extract
: 提取

 

dandelion: 蒲公英
milkweed: 乳草屬植物
sagebrush: 山艾樹

gum: 樹膠

crude rubber: 天然橡膠
Incan and Mayan civilizations: 印加和瑪雅文化

 


semi-fluid: 半流體

breakdown: 分解

 

 

 

Hevea brasiliensis: 橡膠樹

 
 
相關(guān)文章 Related Stories
 
 
 

本頻道最新推薦

     
  為什么下雪時天氣暖
  You are the smartest fish I've ever seen!
  Dog burger
  為什么老了脾氣好
  飛蛾為什么撲火

論壇熱貼

     
  開個題目大家扯:hotel & restaurant
  追求某人
  請教工商年檢如何翻譯
  How to translate “中國老字號”into English?
  "港股直通車"怎么翻譯?
  兩免一補怎么說?




济宁市| 思茅市| 新田县| 洛宁县| 浙江省| 元朗区| 合水县| 十堰市| 深泽县| 广东省| 密山市| 图木舒克市| 墨江| 黑水县| 禹城市| 科尔| 鄢陵县| 曲阳县| 宣恩县| 博乐市| 黄浦区| 东兰县| 泽普县| 淄博市| 南部县| 静海县| 蚌埠市| 来凤县| 昭觉县| 稷山县| 铜鼓县| 盐亭县| 文山县| 彭阳县| 大名县| 清丰县| 平南县| 三穗县| 米林县| 察隅县| 措美县|