All books are divisible into two classes: the books of the hour, and the books of all time 一切書籍都可以分為二類:一時之書與永久之書 Allbooksaredivisibleintotwoclasses:thebooksofthehour,andtheb Allbooksaredivisibleintotwoclasses:thebooksofthehour,andtheb Allbooksaredivisibleintotwoclasses:thebooksofthehour,andtheb