tough nut的用法和樣例：
例句
- I asked her for the money, but she was a tough nut to crack and I went away without it.
我向她要錢(qián)，但她這個(gè)人很難對付，因此我空手而歸。 - The final exam was a tough nut.
畢業(yè)考試不好對付。 - She's a tough nut to crack; I don't think she'll give us permission.
她這個(gè)人不好說(shuō)話(huà)，我想她不會(huì )答應我們的。
