用英语哦,介绍一下算盘的来历和用途帮我用英语写篇介绍算盘的作文吧,,100个词够了,thang you

用英语哦,介绍一下算盘的来历和用途帮我用英语写篇介绍算盘的作文吧,,100个词够了,thang you
用英语哦,介绍一下算盘的来历和用途
帮我用英语写篇介绍算盘的作文吧,,100个词够了,thang you

用英语哦,介绍一下算盘的来历和用途帮我用英语写篇介绍算盘的作文吧,,100个词够了,thang you
An abacus,also called a counting frame,is a calculating tool used primarily by Asians for performing arithmetic processes.Nowadays,abaci are often constructed as a wooden frame with beads sliding on wires,but originally they were beads or stones moved in grooves in sand or on tablets of wood,stone,or metal.The abacus was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants and clerks in China,Japan,Africa,India and elsewhere.
The user of an abacus is called an abacist; he or she slides the beads of the abacus by hand.

。。。。搜篇中文的自己翻译机去

呵呵 亲爱的 这不是 第九单元 的 那个 短文 么 自己 不会 写 么 其实 很简单的 是不是 上课 不认真 听捏 呵呵

The Chinese abacus known as the suànpán is typically 20 cm tall and it comes in various widths depending on the operator. It usually has more than seven rods. There are two beads on each rod in the up...

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The Chinese abacus known as the suànpán is typically 20 cm tall and it comes in various widths depending on the operator. It usually has more than seven rods. There are two beads on each rod in the upper deck and five beads each in the bottom for both decimal and hexadecimal computation. Modern abacuses have one bead on the top deck and four beads on the bottom deck. The beads are usually rounded and made of a hardwood. The beads are counted by moving them up or down towards the beam. If you move them toward the beam, you count their value. If you move away, you don't count their value.[citation needed] The suanpan can be reset to the starting position instantly by a quick jerk along the horizontal axis to spin all the beads away from the horizontal beam at the center.
Suanpans can be used for functions other than counting. Unlike the simple counting board used in elementary schools, very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square root and cube root operations at high speed.
In the famous long scroll Along the River During the Qingming Festival painted by Zhang Zeduan (1085–1145 AD) during the Song Dynasty (960–1297 AD), a suanpan is clearly seen lying beside an account book and doctor's prescriptions on the counter of an apothecary's (Feibao).
The similarity of the Roman abacus to the Chinese one suggests that one could have inspired the other, as there is some evidence of a trade relationship between the Roman Empire and China. However, no direct connection can be demonstrated, and the similarity of the abaci may be coincidental, both ultimately arising from counting with five fingers per hand. Where the Roman model (like most modern Japanese) has 4 plus 1 bead per decimal place, the standard suanpan has 5 plus 2, allowing use with a hexadecimal numeral system. Instead of running on wires as in the Chinese and Japanese models, the beads of Roman model run in grooves, presumably making arithmetic calculations much slower.
Another possible source of the suanpan is Chinese counting rods, which operated with a decimal system but lacked the concept of zero as a place holder. The zero was probably introduced to the Chinese in the Tang Dynasty (618-907 AD) when travel in the Indian Ocean and the Middle East would have provided direct contact with India, allowing them to acquire the concept of zero and the decimal point from Indian merchants and mathematicians.

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