The demand curve of schoolbook is two, is not.

教科书的需求曲线是两条，而不是一条。

Traditional schoolbook says inflation will cause devaluation.

传统的教科书说通货膨胀将导致货币贬值。

She took it as a schoolbook which she used to learn the rules of pronunciation.

她先把词典当作教科书，利用它来学习读音规则。

It is a little bigger than a schoolbook. It has several buttons and a display screen for reading.

它比普通的课本稍大一点，有几个操作按钮和供阅读的显示屏。

Because learning recently do not know this book is the schoolbook of the university necessary buy.

因为最近正在学习，不知道这本书是不是大学的教科书，有没有必要买。