vertical firing shaft

例句：

1. 1. The vertical firing shaft is used to fire projectiles from the ground.
   垂直发射筒用于从地面发射弹丸。
2. 2. The engineer designed a vertical firing shaft that could withstand high pressure.
   工程师设计了一个能承受高压的垂直发射筒。
3. 3. The vertical firing shaft was used in the war to launch artillery shells.
   在战争中，垂直发射筒被用来发射炮弹。