bulleting board 布告栏
A speed-measuring device with large area light screen is introduced. The horizontal distance of light screen is 6 000 mm,which avoids the shortcomings of small testing area of bullet speed testing device,short safe distance and easy-breaking.
介绍了一种基于反射式的大面积光幕测速装置,靶面的横向距离可达6 000mm,避免了现有弹丸测速区截装置测试区域小、安全距离近、容易损坏测速装置等缺点。
参考来源 - 反射式大面积光幕测速装置研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT A bullet is a small piece of metal with a pointed or rounded end, which is fired out of a gun. 子弹
Two of the police fired 16 bullets each.
两名警察各发射了16枚子弹。
PHRASE If someone bites the bullet, they accept that they have to do something unpleasant but necessary. 硬着头皮接受 [journalism]
Tour operators may be forced to bite the bullet and cut prices.
旅游社的经营者们不得不忍痛降价。
词组短语
应用推荐