However, as often happens, evolution has got to work and generated drug-resistant strains of the virus by modifying its protease.
然而，通过病毒自身蛋白酶的转变，进化在发挥着作用，并产生抗药性的菌株，这是极为常见的。
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But urban life may have also influenced human genes, making the descendants of ancient city dwellers more resistant to disease. That's according to a study in the journal Evolution.