The key problem to D-S reasoning is basic probability assignment function, so the algorithm implementation of D-S reasoning is a esrious problem.

在基于D-S推理的信息融合中，其关键问题是基本概率赋值函数的构造。

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Here's another problem that I'd like to solve.

那么我们已经看过了这样的一个例子了。

麻省理工公开课 - 计算机科学及编程导论课程节选

But Nintendo's cooling attitude toward glasses-free 3-D signals a deeper problem: Even once you remove the pesky glasses, the novelty of 3-D wears off.

CNN: Has the 3-D hype bubble finally burst?

I'd like more choice and variety, and that's the problem.

ENGADGET: Editorial: All I want for Christmas is a new HTC Nexus Mobile

Is there something that the kidnappers would demand that you'd say, well, absolutely not, it's too great a problem and in this out case would outweigh the benefits of saving a single life?

NPR: The Morality of Negotiating with Kidnappers