gun tube的用法和樣例：
例句
- The shell exploded in the barrel of the gun.
炮彈在炮管內爆炸了。 - Two different calibre gun barrels are provided.
套件中提供了兩種炮管。 - Italian inventors have been experimenting with mounting large numbers of gun barrels in one frame.This example features 36 mounted on a wagon much like the standard ribault.
義大利軍械專家們潛心鑽研如何將更多炮管安置於同一炮身，最終研製成功三十六管火炮。
