Which is not only a theory problem but also a practical problem.

这既是一个理论问题，也是实践中时有出现的问题。

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However it faces the unavoidable theory problem in modern circumstances.

然而在现代境遇中它却面临着不可避免的理论难题。

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This paper discusses the general theory problem of post-disaster recovery of urban earthquake.

本文研究了城市地震灾后恢复的一般理论问题。

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Studies support the theory that there are several causes, instead of a single environmental cause or genetic problem.

VOA: special.2009.01.06

After all,the problem that fission raises for the personality theory, in a nutshell,is that personalities can split,they can branch.

说到底，人格理论裂变问题的产生，总而言之就是由于人格可以分裂。

耶鲁公开课 - 死亡课程节选

An obvious problem with this theory, and Freud acknowledges this problem in Beyond the Pleasure Principle, is that it's awfully hard to keep death and sex separate.

这个理论的有一个明显的问题，弗洛伊德在《超越快乐原则》中也承认了，那就是很难将死亡与性分开。

耶鲁公开课 - 文学理论导论课程节选

For instance Feast attendees might apply design thinking or game theory to a problem.

FORBES: NYC Feast to International Social Innovation Community

Disproving the Rahm Emanuel theory of the problem, guns purchased elsewhere can enter New York as easily as they do Chicago.

WSJ: Jenkins: Gun Control That Works

Only one man, though, seriously tried to systematize innovation to the point where it could be taught: The Soviet patent examiner Genrich Altshuller came up with TRIZ, the Russian acronym for Theory of Inventive Problem Solving.

FORBES: Magazine Article