不过，有一种恶名昭彰的侵入种，是借由毒害竞争对手而取胜。
At least one notorious invader, however, wins out by poisoning the competition.
不过，借监管消灭所有风险，既不可能，也不可取。
But it's neither possible—nor desirable—to regulate away all risk.
有时教授可能会预留几本课本，不过你可以借短期（几小时到几天）。
Professors sometimes reserve a few copies of their course's book, which you may be able to sign out short-term (a few hours to a few days).
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