交火的英文：
exchange of fire
fire-fight
shooting

参考例句：

At last the small battles stuttered continuously for a month.
最后，小的交火时断时续地又持续了一个月。

They were skirmishing close to the minefield now.
他们当时正在雷区附近小规模交火。

Eyewitnesses said that the military police still exchanged fires with the attackers last night
目击者说，军警到昨天晚间晚间仍在与攻击者交火。

The two sides exchanged fire with artillery, mortars and small arms.
双方交火时动用了大炮、迫击炮和轻武器。

Since the cease-fire there have been no major battles, only scattered firefight
停火以来没有发生过重大的战斗，只不过有一些稀稀拉拉的交火。

exchange是什么意思：
n. 交换，互换，交流；兑换，汇率；交易所
v. 交换，互换；交流；兑换

regional exchange
美国在纽约以外地区的证券交易所

This exchange takes place in the foreign exchange market.
汇兑是在外汇交易市场上进行的。

He gambles on the stock exchange.
他从事股票投机。

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！

fight是什么意思：
n. 斗志，战斗力，比赛
v. 与…作斗争，坚决反对，（为…而）斗争，努力争取，参加，努力克制

This is a clean fight.
这是一场公平的较量。

If they start fighting, we fight back, fight to win peace.
人家打来了，我们就打，打是为了争取和平。

The fight resulted in a stalemate.
战斗形成对峙局面。