Bob hope : the road well-traveled ( softcover ) ( applause books )
鲍勃霍普：沿着这条路经常旅行（平装）（鼓掌书籍）
And the cost of producing the hardcover is more than the softcover .
精装书的制作成本又高于平装书。
But it wasn 't just the softcover format that was revolutionary : de graff was pricing his pocket books at a mere 25 cents .
但它并不只是平装样式，而是一个革命：德格拉夫定价他的口袋书仅25美分。
Book buyers have been used to hardback books being the most expensive , with softcover versions being priced much less , while e-book versions are cheaper still .
买书的人们已经习惯了精装书价格最贵、平装书便宜很多，而电子图书更为廉价的状况。
However , with hard and softcover books , publishers must warehouse their inventory and there are costs associated with that .
