This paper is devoted to the study of problem on arranging product, products transport and price of a single goods in economic net. The policy for maximum net profit is obtained.

本文研究了经济网络中，单一商品的生产组织，调运和定价问题，给出了使经济净收益最大化的具体方法。

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Almost seventy percent of the workers in the study had a new or worsened breathing problem.

在这项研究中，近70%的工作人员有新的或恶化的呼吸问题。

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To return to the problem of water pollution, I'd like you to look at a study conducted in Australia in 2012.

回到水污染问题上来，我想让你看看2012年在澳大利亚进行的一项研究。

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A newly reported British study suggests that taking another drug with a small amount of aspirin may help solve the problem.

VOA: special.2009.10.20

Second, by including the entire eligible Danish population, which is covered by a national tumor registry, the study avoids the problem of selection bias (that is, people who do not make it into your study for various reasons, including refusal).

FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion

The EU study says says the problem of limited capacity is likely to worsen because many busy airports, including London Heathrow and Paris Orly, do not plan to expand.

BBC: EU Commission: Airport slots need improvement

By the end of the study, 215 of the study participants had experienced a heart attack or other cardiovascular problem, and 325 had died from any cause.

CNN: Too much TV time may hurt your heart