一些小规模的研究已经表明，饮食和癌症之间有一种联系。
A number of small-scale studies have already indicated that there is a relationship between diet and cancer.
研究已经表明，比较乐观的人压力较少。
Learn To Be positive: Research has shown that people who are more positive experience less stress.
现在研究已经表明，他们的确比大部分人聪明。
Now research has shown they are cleverer than most people as well.
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