在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

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: 国产成人精品在线 | 免费色网| 亚洲日本久久 | 羞羞视频在线播放 | 在线91| 亚洲国产免费 | 色丁香在线 | 亚洲免费视频在线观看 | 国产成人免费在线 | 色吧久久| 成年人视频在线免费观看 | 在线视频 91 | 玖草在线视频 | 中文字幕一区二区在线观看 | 99视频在线看 | 精品影视 | 国产精品久久久久久久免费大片 | 久久国产精品视频 | 成人中文字幕在线 | 特级毛片在线 | 成人av免费在线观看 | 成人一区二区在线播放 | 成人超碰 | 后进极品白嫩翘臀在线视频 | 国产精品久久久久久久久免费 | 亚洲精品久久久 | 视频一区在线观看 | 91久久 | 国产高清久久 | 黄色av网站免费看 | 成年人在线看片 | 欧美一区二区三区在线 | 2018国产大陆天天弄 | 一区二区精品视频 | 黄色av播放 | 99草草 | 久久亚洲天堂 | 精品久久一区二区三区 | 一二三区不卡视频 | 中文字幕精品一区二区三区精品 | 成人在线一区二区三区 |