a friend, especially one who you have been involved in difficult or dangerous, usually military, activities with

Many of his comrades were killed in the battle. 他的许多战友死在了战场上。

a member of the same political group, especially a communist or socialist group or a trade union

I know my opinion is shared by many of my comrades in the Labour movement. 我知道许多参加工人运动的同志都和我有相同的观点。

[ as form of address ] Welcome to the conference, comrades. 同志们，欢迎你们参加本次大会。