The source of Qu is the core problem of study about relationship of Ci and Qu.

曲源问题是曲学研究中的一个核心问题。

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The main problem of study on Olympic economic shock model is to weaken its negative effects.

削弱这些负面效应的影响是奥运经济冲击模型研究要解决的主要问题。

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ESD is important guarantee of safety running for unites, its reliability is always important problem of study for automation engineer.

自保系统是装置安全运行的重要保证，其可靠性一直是仪表专业人员研究的重要课题。

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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

Indeed that, to a lesser extent, can be a problem for any study of a human network.

ECONOMIST: What maths tells us about us

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

To get around this potential problem, the University of Pennsylvania study only examined studies without a washout period.

FORBES: Health Care