因为金属在大多数生物的催化剂，所以掌控为目的蛋白提供合适的金属的方法对于合成生物学非常重要。

Because metals are the catalysts for so much of biology, knowing how to engineer a supply of the right metals to the right proteins will be important to the success of these ventures.

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在大半个世纪里，大多数生物学家都不愿使用这些词，因为他们牢记着一条进化论的原则，即“进化不能倒退”。

For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says "evolution cannot run backwards".

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现在，大多数糖尿病患者服用的是人类制造的胰岛素，不是在人体内制造的，而是在生产设备中生长的微生物中制造的。

Now, most diabetics take human insulin made, not made in humans, but made in micro-organisms that are growing in a manufacturing facility.

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So these organisms like this are abundant in the world around us and our immune system prevents us from getting sick most of the time.

在我们周围充斥着像这样的生物体,而免疫系统在大多数时候能够抵御疾病

耶鲁公开课 - 生物医学工程探索课程节选