Based on the analysis of the time background of green trade barrier, the author discusses the impact on the export of agricultural products in China.

本文在分析绿色贸易壁垒产生的时代背景的基础上，讨论了绿色贸易壁垒对我国农产品的影响。

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The essay, first of all, expounds the origin of the right to development from the time background of setting forth the right to development and the process of its establishment.

本文首先从发展权提出的时代背景、发展权的确立过程阐述了发展权的由来。

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About the time that schools and others quite reasonably became interested in seeing to it that all children, whatever their background, were fairly treated, intelligence testing became unpopular.

大约在学校和其他机构开始很有兴趣确保所有的孩子，无论他们的背景如何，都能得到公平对待的时候，智力测试就变得不受欢迎了。

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A newspaper account of the time described the background.

当时的报纸是这么描述事件背景的。

耶鲁公开课 - 公正课程节选

The aim is to freeze the runners, but at the same time blur the background with a streaky effect to show speed.

BBC: Picture power: Running for gold

As increasing numbers of mainstream parents -- often single and working full-time -- pull their offspring out of public schools, many find they lack the time or background to teach effectively.

CNN: Web puts the home back in homework

Despite his hopes that a compromise will be reached, Clinton said that there is also disagreement over the length of time allowed to conduct the background check 24 hours versus 72 hours.

CNN: Clinton advocates parental liability on guns