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Rebecca949 发表于 2012-9-4 10:54

VOA慢速英语2012.09.04

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In nineteen twenty-eight a British scientist made a "chance observation." He noticed that some mold had grown in bacteria in a culture plate in his laboratory. Molds can do that. 1928年，一名英国科学家做了一次“偶然的观测”。他注意到，一些霉菌在他实验室的培养皿里的细菌中生长出来。霉菌可以做到这点。
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jizhao19960124 发表于 2012-9-4 22:05

:handshake

zhant220 发表于 2012-9-6 15:56

but this mold that is somehow gets into plate have the ability to kill the bacteria around it. The scientist Alexander Fleming found that the mold was a member of a common group, known as penicillin

alice560 发表于 2012-9-26 11:20

chance observation

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