来自《耶鲁大学开放课程：生物医学工程探索 第5集 第5集》

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  that's not even normally present in people.
  人类细胞中原来没有的基因
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  You're doing that because
  来实现
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  you want to treat disease in a different way.
  不同的治疗手段
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  One way that that's done
  已经成功应用的一种方法是
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  is by introducing genes into cancer cells,
  将基因导入癌细胞
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  genes that aren't normally expressed in any mammalian cell,
  而这种基因通常不在哺乳动物细胞中表达
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  but that will cause the cancer cell to die.
  但是可以导致癌细胞的死亡
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  This example here,
  这里的这个例子思路是
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  the idea is to introduce a gene into tumor cells of a tumor.
  将一个基因导入肿瘤组织的肿瘤细胞中
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  It's a gene that allows you to deliver a drug that's not active
  这一方法利用该基因激活
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  but the gene causes that active - that inactive drug
  另一种已经导入细胞的非活性药物
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  to be converted into an active form that kills the cell.
  来杀死肿瘤细胞