They could be used again and again for different books.
它们可在不同书籍上反复利用。
Alia knew that if the books were to be safe, they must be moved again while the city was quiet.
艾丽娅知道,如果要保证这些书的安全,就必须在城市安静的时候再把它们搬走。
If the books you need are out, you may ask for them to be kept for you when they are returned.
如果你需要的书借出去了,你可以在书还回来时请求为你保留。
And the books cannot be placed on more than one device, so they are not easy to share.
VOA: special.2009.09.03
They're the magic nutrient books: carbohydrates, fat, whatever it happens to be, that's one theme you could follow.
它们是些神奇的营养学书籍,碳水化合物,脂肪,或者其它东西,都可以成为著书的主题
Sometimes he believed they just weren't supposed to be included with the highest canonical books.
有时候人们只是认为,它们不属于最好的正典。
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