A-20：at one's elbow 很近
A: Thank you for lending me the book.
A: 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.
B：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.
A: 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。
