A：Thank you for lending me the book.

谢谢你借书给我。

B：Sure. But it's a very difficult one, you need to have a dictionary at your elbow.

不用谢。可这本书非常难，你手边需要一本字典。

A：But I'm not used to looking up every new word when I'm reading a novel. I only look up the most necessary ones.

可是我不习惯读小说时见到生词就查字典。我只查一些非常必要的词。

Notes:

1.at one's elbow 近在手边的