时间:2019-01-10 作者:英语课 分类:北师大版高中英语模块7(选修)


英语课

[00:01.56]Gunpowder 1

[00:03.47]Gunpowder was invented by the Chinese

[00:05.73]in the eighth century AD.

[00:08.28]Early Chinese scientists discovered

[00:10.64]that they could make an explosive substance

[00:12.76]by mixing sulphur,charcoal and saltpeter.

[00:16.76]Gunpowder was used in warfare 2

[00:18.93]and led to the development of many different

[00:21.00]kinds of weapons.

[00:22.77]For example, rockets carrying an explosive

[00:25.28]shell of gunpowder could be launched

[00:27.98]at enemy soldiers from a bamboo tube.

[00:32.08]The Compass

[00:33.66]The ancient Chinese noticed

[00:34.96]that certain kinds of metals,

[00:36.95]like iron ore, usually aligned 3 themselves

[00:39.39]in a north to south position.

[00:41.84]By the third century,

[00:43.17]they had started making the first,

[00:44.84]simple compassesby floating small pins

[00:47.92]of magnetic metal in bowls of water.

[00:50.74]By the eleventh century,

[00:52.11]the Chinese were using sophisticated

[00:54.05]compasses to navigate 4 their ships at sea.

[00:57.90]In the West magnetism 5 was not discovered

[01:00.42]until the fifteenth century.

[01:02.65]Until this time, European sailors

[01:04.83]were still navigating 6 by the stars.

[01:06.56]



n.火药
  • Gunpowder was introduced into Europe during the first half of the 14th century.在14世纪上半叶,火药传入欧洲。
  • This statement has a strong smell of gunpowder.这是一篇充满火药味的声明。
n.战争(状态);斗争;冲突
  • He addressed the audience on the subject of atomic warfare.他向听众演讲有关原子战争的问题。
  • Their struggle consists mainly in peasant guerrilla warfare.他们的斗争主要是农民游击战。
adj.对齐的,均衡的
  • Make sure the shelf is aligned with the top of the cupboard.务必使搁架与橱柜顶端对齐。
v.航行,飞行;导航,领航
  • He was the first man to navigate the Atlantic by air.他是第一个飞越大西洋的人。
  • Such boats can navigate on the Nile.这种船可以在尼罗河上航行。
n.磁性,吸引力,磁学
  • We know about magnetism by the way magnets act.我们通过磁铁的作用知道磁性是怎么一回事。
  • His success showed his magnetism of courage and devotion.他的成功表现了他的胆量和热诚的魅力。
v.给(船舶、飞机等)引航,导航( navigate的现在分词 );(从海上、空中等)横越;横渡;飞跃
  • These can also be very useful when navigating time-based documents, such as video and audio. 它对于和时间有关的文档非常有用,比如视频和音频文档。 来自About Face 3交互设计精髓
  • Vehicles slowed to a crawl on city roads, navigating slushy snow. 汽车在市区路上行驶缓慢,穿越泥泞的雪地。 来自互联网
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2-Mercaptopyridine
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