smart cookie 聪明的人；指脑子比较聪敏一些的人；聪明的人

【例句】
The boss thinks that guy is one smart cookie.
老板认为那家伙很聪明。

She was a smart cookie, and Eddie felt sure she would be able to suggest something.
她是个聪明的家伙，埃迪相信她能提出好的建议。