Some previous studies have suggested that challenging your brain with mentally stimulating activities might help.
先前的一些研究表明，参与心理刺激的活动来挑战你的大脑可能会有所帮助。
Previous studies on CSR have had trouble differentiating these effects because consumers can be affected by all three.
以前关于企业社会责任的研究在区分这些影响时遇到了困难，因为消费者可能会同时受到这三种影响。
Previous studies have found that more optimistic people have a lower risk of developing chronic diseases, and a lower risk of premature death.
之前的很多研究已经发现，越乐观的人得慢性病的风险越低，过早死亡的风险也越低。
Previous studies have produced inconsistent results.
先前的研究已经产生了不一致的结果。
But previous studies have looked only at a few hospitals.
但在他们以前的研究仅仅调查了少量医院。
The review of previous studies looked at nearly 17, 000 children.
前人研究的回顾共调查了将近17,000个儿童。
Previous studies in factory workers exposed to BPA found even higher levels.
此前的研究发现在接触双酚a的产业工人身上甚至具有更高的浓度。
Previous studies have shown the cat's embedded cry shares a similar frequency.
先前的研究已经表明猫的嵌入叫声具有相近的频率。
Previous studies have suggested it could be caused by chemicals in the environment.
先前的研究已经表明这种缺陷会在特定环境中被某些化学物质诱发。
The threshold temperature has been substantially underestimated in previous studies.
科学家们表示：“实际上，以往的研究低估了临界温度。
Previous studies had tried to address this question, but they produced confusing results.
过去的研究曾试图解决这个问题，但他们得出了令人困惑的结果。
Previous studies have shown similar findings linking a lack of sleep to creeping obesity.
以前的研究已经显示了相似的，即缺少睡眠与肥胖的形成相联系的这样一个结果。
Many previous studies have measured carbon dioxide levels that come out of exhaust pipes.
过去许多研究都测量过出自尾气管的二氧化碳的水平。
Previous studies have suggested that it takes between 400 and 1300 years for this to happen.
先前的研究表明，这种过程会在未来400年至1300年内发生。
From previous studies these regions are known to be associated with resolving ambiguity.
从前面的研究中我们得知，这些区域是与解决歧义有关的。
This increased uncertainty in timing. Also, many previous studies used only one ice core site.
在时限上，还有很多不确定因素，许多早期的研究也只利用了一个冰核点考察地址。
Previous studies found meteorites harbour the other two of the three basic ingredients of life.
早先的研究也发现陨石内蕴含构成生命的三种基础成分中的两样。
Dr Sharp said that he realised the results of his team's research clashed with previous studies.
夏普博士说，他意识到他的小组的研究结果与以往的研究发生了冲突。
Previous studies have suggested that the “caveman” diet could offer protection against diabetes.
以前的研究也表明，“穴居人”的日常饮食可以预防糖尿病。
Previous studies have shown that soya and tofu cut the risk of ovarian cancer and heart disease.
此前的研究认为，大豆和豆腐能降低卵巢癌和心脏病的风险。
Previous studies have suggested that exposure to nature can improve health and alleviate depression.
以前的研究揭示了大自然能改善健康，减轻抑郁。
The differences from previous studies may hint at changes within U.S. society, suggested the authors.
研究者认为，这项调查与先前研究的不同之处暗示着美国社会的变迁。
Previous studies have shown how falling aerosol pollution will affect the rate of global climate change.
此前的研究表明气溶胶污染的降低将影响全球气候变化的速率。
Previous studies in animals and humans have suggested that exercise may improve thinking and memory.
以往有研究表明，运动可以改善人和动物的反应能力和记忆力。
Previous studies in other patient groups have concluded that losing weight can improve the condition.
先前在其他患者人群中的研究得出结论，减肥可以缓解这种状况。
Previous studies have suggested that preschool education programmes and better nourishment can raise IQ scores.
先前的研究表明学前教育和较好的营养可以提高IQ得分。
Previous studies have suggested that preschool education programmes and better nourishment can raise IQ scores.
先前的研究表明学前教育和较好的营养可以提高IQ得分。
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