fire arm

例句：

1. 1.The soldier was armed with a fire arm.
   这名士兵配备了火器。
2. 2. The police were called to the scene armed with fire arms.
   警察被召到现场，手持火器。
3. 3.The soldiers were trained to use all kinds of fire arms.
   士兵们接受过使用各种火器的培训。