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In 1975 psychologist Robert Ader at the University of Rochester School of Medicine con
In 1975 psychologist Robert Ader at the University of Rochester School of Medicine conditioned(使形成条件反射)mice to avoid saccharin(糖精)by simultaneously feeding them the sweetener and injecting them with a drug that while suppressing their immune systems caused stomach upsets.
答案
1975年，罗切斯特大学医学院的心理学家Robert Ader在使老鼠对排斥糖精形成条件反射的试验中，喂食老鼠糖精的同时给它们注射了一种药剂，这种药在破坏老鼠的免疫系统的同时还会引起腹痛。
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