According to the demand of times and two aspects of insufficiency in reading teaching about literary works at present, I carry out the background of my study and explain the cause of writing.

从时代的要求和当前中学文学作品阅读教学的不足两个方面，说明提出本文的研究背景和缘由。

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Study and explain that there is a clear impact on the mutual relations between China's economic growth and environmental pollution, and with the passage of time, this influence is increasing.

研究结果表明，我国的经济增长和环境污染存在着显著的相互影响关系，且随着时间的推移，这种影响日益增大。

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This subject traces the evolution of ideas about nature, and how best to study and explain natural phenomena, beginning in ancient times and continuing through the Middle Ages and the Renaissance.

本课程将从上古时代追溯到中世纪与文艺复兴，探究人们对自然概念的演进，以及对自然现象研究与解释方式的转变。

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But as authors William Chandler and Holly Gwin explain in a recent study for the Carnegie Endowment for International Peace, China's capital markets are extremely small for a country its size.

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Researchers don't yet know how to explain these correlations -- and since the study was not a controlled trial, it's not clear whether marijuana or some other factor in marijuana users' lifestyles actually accounted for the beneficial effects.

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The study itself contains a study designed to look for genes that might explain why some people respond and others don't.

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