不同于十字弩所利用的弩臂弹力，蝎子弩发射的动力来自于动物筋腱扭曲产生的扭力。
Unlike the crossbow the Ballista derives its force from twisted animal sinew and not tension from the frontal arms .
你是不是要去46街那个高中他们校长有把十字弩
Do you have to go to that school on 46th where their principal has a crossbow ?
十字弩