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。
They also reexamined previous studies.
他们还重新审视了之前的研究。
Previous studies have produced inconsistent results.
先前的研究已经产生了不一致的结果。
A few previous studies have hinted at the possibility.
以前的几个研究已经暗示这种可能性。
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。
Previous studies have shown that people blink more when lying.
过去的研究证明当人们撒谎时，眨眼更频繁。
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 of information have reported much lower quantities.
信息先前有研究报告的数量要低得多。
Previous studies have also linked screen time with attention problems.
之前的研究也将花在屏幕前的时间与注意力问题挂钩。
Previous studies had suggested that money was associated with happiness.
先前的很多研究暗示金钱是和快乐相关的。
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 have shown that losing a few key workers can destroy an insect society.
先前的研究已经证明失去几只工蜂能够毁灭整个昆虫社会。
Previous studies have shown that letting fly with a few choice expletives can ease pain.
先前的研究表明，偶尔爆几句粗口可以减轻疼痛。
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。
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。
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。
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