He put those hardbacks on the shelves just for show; he never read them.

他书架上那些精装书不过是为了撑场面，从来没看过。

All books unless specified are hardbacks.

所有的书，除非另有注明，皆为精装书。

In the US, it's claimed that ebooks are now outselling many hardbacks.

在美国电子书销量超过了很多精装本。

We decided that hardbacks would prevail over paperbacks unless the paperbacks contained marginalia30).

我们决定有硬皮精装本的就不留平装本的，但平装本上有批注的则另当别论。