我认输了.
I'm throwing in the towel.
*throw in the towel原是拳击用语,日常会话时常用来表示"认输".
***throw in the towel:to admit that you have been defeated and stop trying 认输;承认失败;放弃努力
I'll never win. I'm throwing in the towel. (我赢不了你,我认输了.)
Don't give up so early. (别那么快就认输.)
I'm giving up.
