... Betsy Ross and the Flag 贝特西·罗斯与美国国旗 The Discovery of Penicillin 青霉素的发现 The Discovery of the X．ray X射线的发现 ...
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青霉素的发现是医学研究史上的一块丰碑。
The discovery of penicillin was a monument in medical research.
农民经常给牛肉和家禽注射青霉素，正因为如此，在被注射过青霉素的奶牛的奶中发现了青霉素。
Farmers often give penicillin to beef and poultry, and because of this, penicillin has been found in the milk of treated cows.
亚历山大弗莱明爵士的实验室座落在伦敦圣玛丽医院，现在仍然保持着他在1928年发现青霉素时的原貌。
Sir Alexander Fleming's laboratory in St Mary's Hospital, London, survives just as it was when he discovered penicillin in 1928.
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