tough nut
常见例句
- But embedded computing is a tough nut to crack.
但嵌入式计算是一块难啃的硬骨头。 - 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。 - Actually, this article is a compilation of my experience of what works and what doesn't work in the world of love, at least for me. Love is a tough nut to crack.
实际上这篇文章只是我的经验总结，关于在爱情世界里什么有用什么没用——至少对我来说。 - Now for the tough nut: ideas for a new, more profitable line of business.
FORBES: Survivor - All the same, Florida looks a tough nut to crack for any Democrat.
ECONOMIST: Two big ’gators pounding away The 返回 tough nut