如何翻译能力与智慧相关短语

3.有头脑 be a brain

他可是个有头脑的人，决不会相信你的那一套。

He's a brain, who wouldn't be fooled into believing your babbling.

4.很能干 to have a lot on the ball

我知道李明很能干，但我怀疑他是否真的愿意到我们这儿来工作。

I know Li Ming has a lot on the ball. But I'm not sure if he likes to work here.