fire shells

• 发射炮弹

fire shells的用法和样例：

例句

1. They are firing shells into the valley.
   他们正向山谷里发射炮弹。
2. Players pushed a button on a control box to make the spaceships move and fire their weapons.
   玩游戏的人按动控制盒的电钮，指挥宇宙飞船的行动并发射炮弹。