FORTY years ago Walter Mischel, an American psychologist, conducted a famous experiment.
四十年前，一位美国的心理学家沃尔特·米歇尔，完成了一项著名的实验。
In 1972, Professor Walter Mischel tested the willpower of 600 four-year-olds to six-year-olds.
1972年，沃尔特·米歇尔教授测试了600名4岁至6岁儿童的意志力。
In 1972, Professor Walter Mischel tested the willpower of 600 four-year-olds to six-year-olds.
1972年，沃尔特·米歇尔教授测试了600名4岁至6岁儿童的意志力。
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