ego

That promotion really boosted her ego (= made her feel better about herself )..那次晋升确实增强了她的自信心。

I need someone to massage my bruised ego (= when you feel less confident than before )..我需要有人来安抚我受挫的自信心。

a fragile ego.脆弱的自尊心

alter ego,n. 密友；个性的另一面；至交

ego identity,自我同一性；自我统合

ego trip,n. 追求个人满足

ego psychology,自我心理学