tough nut

基本解釋

But embedded computing is a tough nut to crack.
但嵌入式計(jì)算是一塊難啃的硬骨頭。
There are some promising drugs in the pipeline. But it's been a really tough nut to crack.
有一些前景不錯(cuò)的藥品已經(jīng)在研發(fā)之中，但要真正實(shí)現(xiàn)確實(shí)還很不容易。
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.
實(shí)際上這篇文章只是我的經(jīng)驗(yàn)總結(jié)，關(guān)于在愛情世界里什么有用什么沒用——至少對(duì)我來說。

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