来自《耶鲁大学开放课程：生物医学工程探索 第4集 第4集》

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  Now I gave you the example of insulin and
  现在我以胰岛素为例
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  you probably wouldn't want to stop insulin production.
  你们恐怕不会希望胰岛素合成被终止
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  That might not be a good thing to do.
  这可不是一件好事
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  What if this is a gene that's causing a cell to be cancerous?
  但假如是个能导致细胞癌变的基因呢
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  It was a gene that was causing a cell
  例如 一个会使细胞恶化
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  to be malignant and to divide without control, for example.
  并不受控制地无限分裂的基因
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  Then you could imagine
  这样你们就会认为
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  blocking gene expression would be a therapy.
  阻止基因的表达是一种治疗手段了
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  You wouldn't want to stop insulin, for example.
  你们不会希望胰岛素的合成停止
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  In fact what you might prefer to do
  事实上 你们更愿意做的恐怕是
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  is start insulin production and
  开启胰岛素的合成
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  we'll talk about ways to do that in just a minute.
  我们马上就会讲到这其中的方法