开炮的英文：
to open fire with artillery; to fire; to bombard; to discharge a gun; to discharge a shot from a gun; to touch off a gun

参考例句：

The noise of cannon fire.
开炮的响声

The soldiers cast loose the guns to prepare the battery for action.
士兵们解开了绳炮索，准备开炮。

open是什么意思：
adj. 打开的；开着的；空旷的；可利用的；公开的；坦率的；愿意接受的
n. 旷野，空旷之地；露天，户外；野外
v. 开，打开；睁开；张开；展开；开始；使开张；开业；展现

They are open to temptations.
他们容易受诱惑。

The flowers are opening.
花正在开放。

an open package
未封上的包裹

fire是什么意思：
n. 火；炉火；火灾；热情；激情；磨难；炮火
v. 点燃；烧制；烘制；激励；充满激情；解雇；着火；开枪

The fire raged.
大火熊熊燃烧。

They fired at the robbers.
他们向强盗开枪。

The house was on fire.
房子起火了！

artillery是什么意思：
n. 火炮，大炮；炮队；炮术

Artillery cratered the road.
大炮把路面轰得坑坑洼洼。

artillery that was prepositioned at strategic points in the desert.
预先放置在沙漠中战略要点处的军火

The artillery worried the enemy with intermittent shelling.
大炮以间断的轰击骚扰敌人。