抛石机

抛石机在我国古代军事史与技术史上都产生了深远影响。

Trebuchet had deep affect on Chinese ancient military history and technology history .

抛石机是我国古代一种远程重型战具，应用于攻击防守战中。

The trebuchet is a long distance heavy offensive and defensive weapon in the ancient China .

防汛抢险抛石机抛石排的有限元分析

Finite Element Analysis of the Throwing Block Raft of the Throwing Block Machine for Flood Prevention

通气扇的格栅进入……也许是用抛石机或弹弓呃…身材矮小的人可以爬进去

grating in the air vent , maybe a ballista or a catapult , um ... Somebody tiny could crawl in there .

抛石机是用于在河流防汛抢险中抛掷补充根石的一种机械设备。

The stone-throwing machine is a type of mechanical equipment mainly used to throw foundation stones to the bottom of the dam in flood prevention .

从静态和动态两方面对抛石机的稳定性进行评价，以保证整机作业和运行的安全。

The stability analysis of static and dynamic state of the whole mechanism is conducted to estimate the equipment , which can ensure the safe and stability of operation of the equipment .