Buy second hand furniture, save the trees.
购买二手家具,拯救树木。
Even if we buy second hand books, we pay a lot.
即使我们买二手书,我们也花了很多钱。
While they could once buy second-hand textbooks, or share copies with friends, the digital systems are essentially impossible to avoid.
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。
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