The dissertation consists of four subsection: the first subsection summarizes the background of study of Problem Solving.

本文共分四部分：第一部分概述问题解决研究的背景。

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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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Declining mental function is often seen as a problem of old age, but certain aspects of brain function actually begin their decline in young adulthood, a new study suggests.

心智功能衰退通常被视为老年问题，但一项新的研究表明，大脑功能的某些方面实际上在青年时代就开始衰退了。

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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

What's true problem of that study?

这项研究到底揭示了什么问题？

麻省理工公开课 - 媒体、教育、市场课程节选

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

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

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