久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

您現在的位置: > Language Tips > Easy English > Odd Question  
 





 
算盤是怎么來的(通訊員稿)
[ 2006-11-27 15:32 ]

算盤是人類歷史上一種重要的計算工具,被稱為"現代計算機"的前身。現在,就讓我們來探究一下算盤的歷史吧!

The origins of the abacus are disputed, as many different cultures have been known to have used similar tools. It is known to have existed in Babylonia and in China, and was likely invented sometime between 1000 BCE and 500 BCE. The first abacus was almost certainly based on a flat stone covered with sand or dust. Lines were drawn in the sand and pebbles used to aid calculations. From this, a variety of abaci were developed; the most popular were based on the bi-quinary system, using a combination of two bases (base-2 and base-5) to represent decimal numbers.

The use of the word abacus dates back to before 1387 when a Middle English word borrowed the word from Latin to describe a sandboard abacus. The Latin word came from abakos, the Greek genitive form of abax ("calculating-table"). Because abax also had the sense of "table sprinkled with sand or dust, used for drawing geometric figures," some linguists speculate that the Greek word may be derived from a Semitic root, ābāq, the Hebrew word for "dust." Though details of the transmission are obscure, it may also be derived from the Phoenician word abak, meaning "sand". The plural of abacus is abaci.

A tablet found on the island of Salamis (near Greece) in 1846 dates back to the Babylonians of 300 BCE making it the oldest counting board discovered so far. It was originally thought to be a gaming board. Its construction is a slab of white marble measuring 149 cm in length, 75 cm in width and 4.5 cm thick, on which are 5 groups of markings. In the center of the tablet are a set of 5 parallel lines equally divided by a vertical line, capped with a semi-circle at the intersection of the bottom-most horizontal line and the single vertical line. Below these lines is a wide space with a horizontal crack dividing it. Below this crack is another group of eleven parallel lines, again divided into two sections by a line perpendicular to them but with the semi-circle at the top of the intersection; the third, sixth and ninth of these lines are marked with a cross where they intersect with the vertical line.

Salamis: 沙拉米斯


(南開大學通訊員田墨供稿 英語點津Annabel 編輯)

 
 
相關文章 Related Stories
 
         
 
 
 
 
 
         
 
 

48小時內最熱門

     

本頻道最新推薦

     
  算盤是怎么來的(通訊員稿)
  彩虹是怎么形成的?
  A smart thief!
  為什么夜晚飛機降落時要調暗機艙里的燈?(通訊員稿)
  No smoking!

論壇熱貼

     
  福娃英文名更改,為何事先不考慮好?
  男扮女裝,女扮男裝?
  請教高人:關于社保方面的詞匯
  評頭論足之妙語連篇
  常用英語口語1000句
  翻譯:老鄉見老鄉,兩眼淚汪汪




主站蜘蛛池模板: 日韩欧美一级a毛片欧美一级 | 亚洲欧美日韩高清 | 日本三级成人午夜视频网 | 污到下面流水的视频 | 看全色黄大色黄大片女图片 | 男人添女人下面免费毛片 | 欧美成人精品高清在线播放 | 日韩在线中文字幕 | 欧美第一网站 | 67194成人手机在线 | 国产性videostv另类极品 | 亚洲精品午夜久久久伊人 | 欧美一级做一级爱a做片性 欧美一欧美一级毛片 | 亚洲无色 | 在线观看视频99 | chinese宾馆自拍hd | 最新主播福利视频在线观看 | 精品久久久久久综合网 | 免费人成黄页网站在线观看 | 日本草草视频在线观看 | 5x性区m免费毛片视频看看 | 亚洲成a v人片在线观看 | 成人国产精品一级毛片视频 | 日韩黄色视屏 | 99久久久久国产精品免费 | 成人区视频 | 手机看片国产精品 | 日韩高清一级毛片 | 欧美精品久久天天躁 | 美女张开腿让男人桶下面 | a级片黄色片 | 久久国产精品免费网站 | 特黄女一级毛片 | 在线成人a毛片免费播放 | 成人一a毛片免费视频 | 女网址www呦 | 国产一级大片 | 久久精品久久精品国产大片 | www亚洲视频| 日韩欧美一区二区三区免费观看 | 亚洲男女免费视频 |