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一天晚上,年轻的俄国生理学家巴甫洛夫(1849—1936年)终于下决心走出实验室,与未婚妻西玛会面去了.他们很难得相见,相会没多久,巴甫洛夫就
One night, the young Russian physiologist Pavlov (1849-1936) finally resolved to step out of the laboratory and meet with his fiancée, Cima. They hardly meet each other. Before long, Pavlov