看似不同的癌症诱因有一个共同点，那就是都会引起基因损伤，锁定这些开关使其处于“全开”的状态。
The common aspect of the apparently disparate causes of cancer is that they induced genetic damage, locking these switches full on.
他们把搜索锁定在哺乳动物上，因为哺乳动物的身体跟人类的身体功能非常相似——而且特别把搜索锁定在那些富裕国家里与人共同生活或在人周边生活的哺乳动物上。
They limited their search to mammals, whose bodies work much like humans' do-and, specifically, to those mammals living with or around people in the rich world.
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