因为它全是数字化的，它淘汰了二手书市场，也杜绝了任何共享，而且因为作业和考试都是通过准入码进行的，它让人们失去了选择退出的任何能力。
Because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.
填埋可燃气体收集再利用，杜绝了爆炸危险。
The collection and reuse of landfill gas put an end to the risk of explosion.
结果病案的安全管理得到加强，杜绝了病案丢失。
Results Safety management of medical records has been strengthened and the "lost" phenomenon of medical records has been prevented.
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