免费国产自久久久久三四区久久_久久99性xxx老妇胖精品_欧美女女_老司机深夜福利网站_91影视免费版在线看_91九色porny首页最多播放

position: EnglishChannel  > InnovationChina> Crossbow: Ancient Chinese Machinery Invention

Crossbow: Ancient Chinese Machinery Invention

Source: Science and Technology Daily | 2023-06-08 13:39:18 | Author: Bi Weizi


By?Bi?Weizi


An ancient crossbow vehicle is displayed on the Ming City Wall in Nanjing, China.?(PHOTO: VCG)

The use of bow and arrow for hunting and warfare dates back to the Paleolithic period in many parts of the world. Thousands of years ago, the crossbow was then invented by Chinese on the basic bow design, expanding the use of mechanical and hand-held weapons, and revolutionizing the battlefield.

Chinese archaeologists believe that crossbows may have been invented as early as 2000 B.C., based on artifacts such as bones, stones, and shells that may have been crossbow triggers. The earliest hand-held crossbow with a bronze trigger was unearthed in a tomb in Qufu, Shandong province, in the ancient Chinese state of Lu during the Spring and Autumn Period (771-476 BC).

The crossbow is composed of three parts: the bow, the tiller and the lock. The bow, also called the prod, is mounted on the tiller, which is usually the wooden body, and the lock refers to the release mechanism, including the string, sears, trigger lever and casing. When the shooter releases a mechanism, the crossbow fires arrows or bolts propelled by the mechanical energy of the previously taut bowstring.

Developed from the traditional bow, the crossbow is capable of firing multiple arrows with greater power and precision. The locking mechanism allows crossbow shooters to handle more draw weight and maintain the draw with significantly less physical exertion, by limiting the shooter's stamina to pulling the string into the lock and then releasing the shot by depressing the trigger.

The crossbow was an important factor in the success of the Chinese states against foreign armies. Western scholars believe that the Chinese crossbow in the Warring States period can be compared with modern rifles, and it is one of the outstanding achievements of ancient engineering technology, reflecting the excellent scientific and technological level of ancient China.

Editor:龍云

Top News

Forging a Resilient Economy with Sci-tech Power

Tiangong Ultra, developed by the Beijing Humanoid Robot Innovation Center, won the world's first half-marathon for humanoid robots in Beijing on April 19, demonstrating the prospects of China's humanoid robot industry and the epitome of the country's strategic emerging industries and future industries. These industries are surging ahead, facilitating the construction of a resilient economy with sci-tech force.

抱歉,您使用的瀏覽器版本過低或開啟了瀏覽器兼容模式,這會影響您正常瀏覽本網頁

您可以進行以下操作:

1.將瀏覽器切換回極速模式

2.點擊下面圖標升級或更換您的瀏覽器

3.暫不升級,繼續瀏覽

繼續瀏覽
主站蜘蛛池模板: 成本人在线观看视频网站 | 欧美日韩在线精品一区二区三区 | av明星换脸无码精品区 | 亚洲无吗视频 | 第一福利 fulione.net | 嗯嗯嗯亚洲精品国产精品一区 | 日韩一区二区三区四区视频 | 免费的成人毛片 | 久久精品少妇免费理伦视频 | 一区二区三区在线观看国产 | 国产又黄又粗又爽又色的视频 | 亚洲激情综合在线 | www久久精品| 精品免费视频一区二区 | 后入内射欧美99二区视频 | 中文字幕乱妇无码AV在线 | 日韩免费在线播放 | 西西人体444WwW高清大胆 | 亚洲欧美精品水蜜桃 | 黄色成人免费视频 | 亚洲免费在线视频 | 九九热视频这里有精品 | 狠狠久久亚洲欧美专 | 国产亚洲欧美在线另类 | 亚洲第一区se | 久久中文字幕免费 | 国产精品a久久久久 | 国产在线精品一区二区中文 | 国产成人精品一区二区三区在线 | 欧美性猛交一区二区三区精品 | 337P大胆日本欧美人体艺术噜噜噜 | 一区二区三区成人久久爱 | 亚洲成a人片在线观看中 | 亚洲欧美综合一区二区三区黄大片 | 久久久久久久久久久影院 | 国产精品久久久久久久久大全 | 毛片黄色 | 最新中文字幕免费视频 | h漫在线观看| 在线欧美国产 | 国产无套无码AⅤ在线观看 国产成a人片在线观看视频99 |