Of those, nearly half were resistant to two or more commonly used antibiotics, like penicillin and erythromycin.

当然，其中近一半对两种或两种以上的常用抗生毒有抗药性，比如青霉素和红霉素。

What they did was they took E.coli, which can be a pretty nasty pathogen, and they treated it with two common antibiotics: doxycycline and erythromycin.

他们所做的是，他们提取了大肠杆菌（一种非常讨厌的病原体），然后用两种常见的抗生素进行治疗：多西环素和红霉素。