undefeated
adj. 未被击败的
例句
She was undefeated for 13 years.
她曾十三年未被战胜过。
《柯林斯英汉双解大词典》
They are undefeated in 13 games.
他们13场比赛未被打败过。
《牛津词典》
I'd like to fight him because he's undefeated and I want to be the first man to beat him.
我想跟他比赛拳击，因为他从未被打败过，而我想成为第一个战胜他的人。
