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。
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？
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。
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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