I can't remember the name off the top of my head, but I can look it up for you.

我一时想不起这个名字，不过我可以给你查一查。

I look it up in a dictionary.

我在字典里查一查。

Why don't you look it up in the encyclopedia?

你为什么不去查百科全书？

Look it up in your camera manual.

请查看您的相机手册。

Sally: Well could you look it up?

你现在能找找么？