When you don't produce enough insulin yourself, as diabetics do not, then you can use insulin as a drug.

如果你的体内不能产生足够的胰岛素,例如糖尿病人,你就可以将胰岛素作为药物使用

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Diabetics whose pancreas does not function properly, so don't make enough insulin, don't have enough insulin present for normal glucose metabolism so they can't handle sugars properly.

糖尿病人的胰脏功能失调,因此胰岛素分泌不足,影响了正常的血糖代谢,所以他们不能正常地调节血糖

耶鲁公开课 - 生物医学工程探索课程节选

I'll use that one as the example because it's a familiar one to most people and you know that the protein insulin is made only in your pancreas and certain cells of the pancreas.

我把它作为例子,是因为大多数人都很熟悉它,胰岛素只在胰腺中进行合成,某些胰腺细胞能够合成胰岛素

耶鲁公开课 - 生物医学工程探索课程节选