膛线

例句：

1. 1. The bullets in the gun have a distinctive arcing pattern, which is known as "tungsten carbide".
   枪支中的子弹具有独特的弧形模式，被称为“钨碳化物”。
2. 2. The bullet's trajectory is influenced by the design of the barrel, which includes tungsten carbide linings.
   子弹的轨迹受到枪管设计的影响，其中包括钨碳化物衬层。
3. 3.The tungsten carbide lining helps to improve the accuracy and speed of the bullet.
   钨碳化物衬层有助于提高子弹的准确性和速度。