penicillin
英 [pen?'s?l?n]
美[,p?n?'s?l?n]
考試真題
- And the reality is that antibiotics have been responsible for saving millions of lives since penicillin, one of the earliest antibiotics, was first used on a clinical basis 70 years ago.
出自-2017年6月聽(tīng)力原文