And a slinger is someone who has a leather pouch with two long cords attached to it, and they put a projectile, either a rock or a lead ball, inside the pouch, and they whirl it around like this and they let one of the cords go, and the effect is to send the projectile forward towards its target.
投石兵的武器，就是一个皮囊 两端有长绳系着 他们把石弹或铅弹放进皮囊 然后像这样挥舞着 再放掉一根绳 就可以把弹物抛出 击中目标