I do not always have ambitions to do advanced studies on any topic, thus the books I bought cover a wide range of subjects, and every subject is covered a little. Most of my books are the translated version of the world literature works and the Chinese collections of poem. Others are introductions and primers. I don't like to borrow books from other people or library. Those borrowed books couldn't satisfy me, except for those I bought. This can be seemed as a desire to own something.