New research published in two studies suggests that smoking may also affect another vital organ: the brain.

两项新发表的研究表明，吸烟可能会影响人类的重要器官：大脑。

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Research in Mexico City suggested that secondary aerosols made up two-thirds of particulate pollution, but earlier studies in Los Angeles showed the reverse, Jimenez says.

Jimenez说在墨西哥城进行的研究显示次生气溶胶占颗粒物污染的三分之二，但早些时候在洛杉矶的研究结果与之相反。

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Empirical social research and theoretical studies constitute the two major traditions in modern sociology.

在现代社会学中，经验社会研究和理论研究构成了这一学科的两大主要传统。

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In that study, researchers looked at the data from two already completed studies, the Vioxx Gastrointestinal Outcomes Research study (VIGOR) and Celecoxib Long-Term Arthritis Safety Study (CLASS), and concluded that both drugs might slightly increase the risk of cardiac events such as heart attack and stroke.

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