These proteins have functions that are essential for life of the cell, they transport molecules back and forth across the membrane.

这些蛋白所起的功能,对于细胞生存至关重要,它们负责转运分子通过细胞膜进出细胞

耶鲁公开课 - 生物医学工程探索课程节选

Because bacteria are outside of cells and when antibodies bind to them they can neutralize them.

因为细菌生存在细胞外,抗体结合细菌并中和掉它们

耶鲁公开课 - 生物医学工程探索课程节选

Now, what does that have to do with the life of a cell inside the body?

这一特性,对我们体内细胞生存有什么意义呢

耶鲁公开课 - 生物医学工程探索课程节选