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1·This is a tough nut to crack.

这是一件棘手的事。

2·Sunday's match will be a tough nut to crack.

周日的比赛将是场硬仗。

3·But embedded computing is a tough nut to crack.

但嵌入式计算是一块难啃的硬骨头。

4·What makes the brain such a tough nut to crack?

是什么让大脑成为如此难砸的死硬坚果？

5·And so this is going to be a tough nut to crack.

所以这将会是一项棘手的任务。

6·This is a tough nut to crack. It's going to take some time to figure out.

这是一件棘手的事。要花些时间才能想出来。

7·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。

8·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。

9·It is a tough nut for him to crack.

这对他而言是一个难题。