In the past a single cut or a sip from the wrong puddle could kill you.

在过去，一个小小的伤口或喝了不该喝的水池里的水都有可能会杀死你。

That's what bioengineers at the University of Michigan are working on. Operations without a single cut into the skin.

这是密歇根大学的生物工程师们正在致力于的研究。不用切割皮肤即可完成的手术。