火药英语介绍简短

全世界专利的40%都可以在中国科技史找到原型。四大发明，算什么！可惜，那些专利都不是中国的。为什么？

写作思路：罗列出中国的四大发明，写出这些发明的伟大之处，使用简单的英文句子描写出这些。

正文：

There are four world famous inventions in China, one is gunpowder, the other is compass, the third is printing and the fourth is papermaking.

我国有世界著名的四大发明，一是火药，二是指南针，三是印刷术，四是造纸术。

This makes our ancient China become an ancient civilization.

这让我们中国古代成了文明古国。

China's four great inventions have played an irreplaceable role in various fields of science and technology.

中国的四大发明在各个科技领域中起到了不可替代的重要作用。

Gunpowder. Gunpowder was invented by us.

火药，火药是我们发明的。

What does gunpowder bring us?

火药给我们带来什么东西呢？

It brought fireworks, firecrackers, fireworks, mining, and aerospace.

带来了礼花、带来了鞭炮、用于制造烟花爆竹、用于采矿，还有用于航天事业的发展。

Up to now, gunpowder has played an important role in our history.

到今天为止火药在我们的历史上发挥着巨大的作用。

Compass, China's Zheng He with the compass seven voyages, opened up the Chinese culture into the world's first.

指南针，我国的郑和用指南针七下西洋，开拓了中华民族文化进军世界的先河。

The earliest compass was called "Sinan" in China.

最早的指南针中国人称之为“司南”。

The compass is also used in navigation, as well as for military personnel to locate.

指南针也被用于航海，以及军事家确定方位。

Printing, it is said that a man named Bi Sheng invented letterpress printing.

印刷术，相传有个叫毕升的人发明了活版印刷术。

With the development of modern industry, laser Phototypesetting, digital technology and other new printing technologies will be used in modern life.

随着现代工业的发展，激光照排、数字技术等新型印刷技术将用于现代生活中。

Cai Lun is a great inventor of papermaking in China. He invented papermaking.

造纸术，蔡伦是我国伟大的发明家，是他发明了造纸术。

With the invention and spread of papermaking, the carrier cost of characters has been greatly reduced, thus greatly promoting the development of science and technology and economy in the world.

造纸的发明与传播，使文字的载体成本得到了大幅度的下降，从而极大地推动了世界科技、经济的发展。

The four great inventions have made us proud and promoted the continuous development of Chinese civilization, but now we have some inventions which are backward. For example, papermaking and printing are very advanced in foreign countries. Therefore, we should study hard and master knowledge to make our motherland stronger.

四大发明曾让我们自豪过，也曾推动中华文明向前不断发展，可是现在有部分发明我们已经处于落后局面，比如造纸术、印刷术在外国已经很先进了，因此我们应该好好学习，掌握知识，才能让我们的祖国更加强大。

Gunpowder, also called black powder, is an explosive mixture of sulfur, charcoal and potassium nitrate, KNO3 (also known as saltpetre/saltpeter) that burns rapidly, producing volumes of hot solids and gases which can be used as a propellant in firearms and as a pyrotechnic composition in fireworks. The term gunpowder is also often used more broadly to describe any propellant powder used in firearms. Modern firearms do not use the traditional gunpowder (black powder) described in this article, but instead use smokeless powder. In this article, the terms gunpowder and black powder are used interchangeably.Gunpowder is classified as a low explosive because of its slow decomposition rate and consequently low brisance. Low explosives produce a subsonic deflagration wave rather than the supersonic detonation wave produced by brisants, or high explosives. The gases produced by burning gunpowder generate enough pressure to propel a bullet, but not enough to destroy the barrel of a firearm. This makes gunpowder less suitable for shattering rock or fortifications, where high explosives such as TNT are preferred.The term "black powder" was coined in the late 19th century to distinguish prior gunpowder formulations from the new smokeless powders and semi-smokeless powders. (Semi-smokeless powders featured bulk volume properties that approximated black powder in terms of chamber pressure when used in firearms, but had significantly reduced amounts of smoke and combustion products; they ranged in color from brownish tan to yellow to white. Most of the bulk semi-smokeless powders ceased to be manufactured in the 1920s.)[1][2][3]Black powder is a granular mixture ofa nitrate—typically potassium nitrate (KNO3)—which supplies oxygen for the reaction; charcoal, which provides fuel for the reaction in the form of carbon (C); sulfur (S), which, while also a fuel, lowers the temperature of ignition and increases the speed of combustion. Potassium nitrate is the most important ingredient in terms of both bulk and function because the combustion process releases oxygen from the potassium nitrate, promoting the rapid burning of the other ingredients.[4] To reduce the likelihood of accidental ignition by static electricity, the granules of modern black powder are typically coated with graphite, which prevents the build-up of electrostatic charge.The current standard composition for black powder manufactured by pyrotechnicians was adopted as long ago as 1780. It is 75% potassium nitrate, 15% softwood charcoal, and 10% sulfur.[5] These ratios have varied over the centuries and by country, and can be altered somewhat depending on the purpose of the powder. For instance, coarser grades of black powder, unsuitable for use in firearms but adequate for blasting rock in quarrying operations, is called blasting powder rather than gun powder; it is often made with the cheaper sodium nitrate substituted for potassium nitrate in proportions of 60% nitrate, 20% charcoal and 20% sulfur.[citation needed]The burn rate of black powder can be changed by corning. Corning first compresses the fine black powder meal into blocks with a fixed density (1.7 g/cm³). The blocks are then broken up into granules. These granules are then sorted by size to give the various grades of black powder. In the United States, standard grades of black powder run from the coarse Fg grade used in large bore rifles and small cannons, through FFg (medium and smallbore arms such as muskets and fusils), FFFg (smallbore rifles and pistols), and FFFFg (extreme small bore, short pistols and most commonly for priming flintlocks). In the United Kingdom, the gunpowder grains are categorised by mesh size: the BSS sieve mesh size, being the smallest mesh size on which no grains were retained. Recognised grain sizes are Gunpowder 'G 7', 'G 20', 'G 40', and 'G 90'.