But embedded computing is a tough nut to crack.

但嵌入式计算是一块难啃的硬骨头。

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There are some promising drugs in the pipeline. But it's been a really tough nut to crack.

有一些前景不错的药品已经在研发之中，但要真正实现确实还很不容易。

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My new boss is a tough nut to crack. I never know if he's pleased with my work.

我的新老板是个很难相处的人。我永远也不知道他是否对我的工作满意。

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On an afternoon when Fulham's well-organised defence proved a tough nut to crack, Carroll's improved mobility and goal threat were plain to see.

BBC: Chris Hughton talks up Andy Carroll's England claims