participate in a war, enter a war
我想要参战
I want to join the fight.
— 指环王3：王者无敌 (2003)
请你让我参战
Please let me join the battle.
他跟你一样有参战的理由
He has just as much reason to join the fight as you do.
我的朋友都参战了只有我留下来会很丢脸
All my friends have gone off to fight, and I’d be ashamed to be the only one left behind.