This is the 4107th most frequent Chinese word.
参战
To participate in war.
In this sentence, '参战' is used as a verb meaning 'to participate or engage in war'. It denotes an action taken by the army to be actively involved in combat.
军队在战争爆发时迅速参战。
The army promptly engaged in the war when it broke out.
Here, '参战' is used as a noun denoting the concept or act of engaging in war, reflecting an abstract stance towards conflict participation.
我不支持任何形式的参战行动。
I do not support any form of engagement in war.
In this context, '参战' as a noun represents the idea or decision of participating in a war, serving as the subject of debate or consideration.