All books are divisible into two classes : the books of hour , and the books of all time .
All books are divisible into two classes : the books of hour , and the books of all time .
所有的书可以分为两类：时兴的书和永久的书。
All books are divisible into two classes : the books of hour , and the books of all time .
所有的书可以分为两类：时兴的书和永久的书。