臼炮的英文：
mortar

mortar是什么意思：
n. 灰泥；迫击炮；臼
v. 用迫击炮攻击；用灰泥涂抹

This is a mortar for millet.
这是舂小米用的臼。

To bombard with mortar shells.
用砂浆砌合

He was killed in a mortar attack.
他死于迫击炮炮击。

The farmers pound rice in a mortar.
农民们在臼中舂米。

The enemy was mortarring a hilltop.
敌人正在用迫击炮轰击山头儿。