大多数的抗生素直接攻击使我们致病的细菌，比方说盘尼西林，能使细菌的坚韧的细胞外壁软化到一定程度，然后使它们中的大多数简单地胀爆死掉。
Most antibiotics directly attack the microbes that make us ill. Penicillin, for example, weakens bugs' tough outer wall to the point that many of them simply explode.
我妈妈对盘尼西林过敏，所以医生给她另一种抗生素。
My mom is allergic to penicillin, so the doctor gave her a different antibiotic.
亚历山大·弗莱明爵士偶然发现了盘尼西林的抗生素特性，当时他正从事于一项性质完全不同的研究。
Sir Alexander Fleming alighted on the antibiotic properties of penicillin while he was engaged on research of a quite different nature.
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