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

当，近一半对两种或两种以上常用抗生毒有抗药，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.

们所做，们提取了大肠杆菌（一种非常讨厌病原体），后用两种常见抗生素进行治疗：多西环素和红霉素。