Since antibiotics are not very selective as to which bacteria they attack, those prescribed for a toothache can quickly wipe out a whole population of intestinal microbes.
因为抗生素对它要对抗的细菌没有很大的选择性,为治牙疼而开出抗生素可能会很快杀死一大批大肠中的细菌。
2
In a straight fight, therefore, it was the drug-sensitive strain that had the selective advantage when faced with a two-pronged attack.