1. Having a smooth bore. Use of a gun barrel. 具有一个平滑的枪膛。用来指一支枪的''。'枪管'。''。
2. A method to increase the service life of gun barrel by adding the nano material to the propellant is presented. 提出了一种通过在发射药中添加纳米复合材料来延长武器身管使用寿命的方法。
3. The deep thud of a 155-millimeter howitzer echoes off the mountains as what looks like an artillery shell speeds from the gun barrel. 155毫米榴弹炮低沉的炮声在山间迴荡，有个很像炮弹的东西从炮管中加速冲出。
英英解释
n.
1. a tube through which a bullet travels when a gun is fired
