虽然曾经他们可以购买二手课本，或者和朋友共享复印本，但数字系统根本无法避免。

While they could once buy second-hand textbooks, or share copies with friends, the digital systems are essentially impossible to avoid.

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如果没有，他们可能会购买一个二手的。

If not, they will probably buy one secondhand.

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我们经常为餐馆购买二手厨房设备。

We frequently buy reconditioned kitchen equipment for our restaurants.

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