One of the books was a very large volume, an arithmetic text, heavily bound in leather.
其中一本书是一本很厚的算术课本，用羊皮纸包得很厚。
Or you're allowed to enter the stack room to rind books for yourself, you can look up the bound volume or index for the articles relative to the subject, on which you are going to write thesis.
或者你可以进入书库，可以看着书自己挑，你可以查找合订本或通过索引来找有关这个主题的文章，你想要写的论点。
He bound up the two books into one volume.
他将两本书装订成一册。
He bound up the two books into one volume.
他将两本书装订成一册。
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