It's a tricky problem that can take even a powerful computer a week to calculate.

这个问题的数学解答比较复杂，甚至一台高效计算机也需要花费一个星期来计算。

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What would you do if you had a tricky problem at work?

在工作中遇到了棘手的问题，你会怎么办？

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EVEN for one of Europe's most efficient countries, it is a tricky problem.

即使是对这个最有效率的欧洲国家而言，这也是一个相当棘手的问题。

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So, that is a tricky problem to begin with because if you take this formula here, it tells you y if you know t, but no, we're not saying that.

以这个问题刚开始的时候有点难度,因为如果你要用这个公式,求y的时候就一定要知道t,但是,我们不知道

耶鲁公开课 - 基础物理课程节选

This is a tricky problem.

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Experts and leading government agencies have been working on the space junk problem for decades, but it's a tricky one to solve, Schonberg told CNN.

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But it struggled to agree on a valuation of Prodeco with Xstrata, and would presumably face the same problem with its other assets meaning a merger would be tricky to negotiate.

ECONOMIST: Xstrata and Glencore