She said she would buy the book when it comes out in paperback.
她说等那本书的平装本面市后她会买一本。
Another analogy is to the invention of the paperback book; by reducing the cost of books, it increased the demand for them.
还可以推论出另一点，平装书的发明；通过减少图书的成本，增加了对图书的需求。
And unlike my paperback book, my eBook isn't going to cost you anything because I'm giving it away for free!
而且不像我的平装书，我的电子书不会花费你一毛钱因为完全就是送的！
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