投石机: 古代投掷物体之发射器,用作发射长箭或重型球状物.Ballista: Ancient missile launcher designed to hurl long arrows or heavy Balls.最大之投石机可相当准确地发射27公斤重物到约450 公尺 处的目标.The largest could accurately hurl 60 - lb ( 27 - kg ) weights up to about 500 ...

“投石机”的英语可以翻译为：mangonel ...