她是个典型的功利主义者，为了升职甚至不惜背叛多年的同事。

She's such a ___careerist that she would betray long-time colleagues just for a promotion.

他是个典型的职业至上者，为了升职放弃了所有爱好。

He's such a ___careerist that he gave up all his hobbies for promotions.