a) 桌子上有一个杯子和一本书。
b) 他想看我的书。

a) On top of the table there is one cup and one book
Question: What is on top of the table?
Answer: 桌子上有一个杯子和一本书。

b) Can I look at your book?
Question: What does he want to do?
Answer: 他想看看你的书。

1 cup, 1 book
look at my book

a) 桌子上有一个杯子和一本书。
b) 他想看一下他的书。

A - There is a cup and a book on the table.
B - He would like to look at his/her book.

a)桌字上有一个杯子和一本书。
b)他想做看你的书。