A single good action will not change your life, but the same action repeated 1,000 times will have an important effect on your life.
一次好的行动不会改变你的生活,但是同样的行动重复一千次会对你的生活产生重要的影响。
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A case in point is the study by Linda Sax at UCLA, who used data from a large national survey of college freshmen to evaluate the effect of single-sex versus coeducational high schools.