pivot gun

例句：

1. 1. The pivot gun isthe key to unlocking the door.
   转轴枪是打开门的关键。
2. 2. Thepivot gun was used to stabilize the structureduring construction.
   转轴枪被用来在建设期间稳定结构。
3. 3. The pivot gunwas a revolutionary tool in the field ofmechanics.
   转轴枪是机械领域的一项革命性工具。