的意思 a tough nut

1. He may seem intimidating, but once you get to know him, he's not such a tough nut to crack.
他可能看起来很令人生畏，但一旦你了解他，他并不是那么难以理解。

2. Solving this math problem is proving to be a tough nut to crack for me.
解决这个数学问题对我来说是一个难题。

3. She's always been a tough nut to crack, but I finally got her to open up about her feelings.
她一直是一个难以理解的人，但我终于让她敞开了心扉谈论她的感受。

4. The mysterious man at the party was a tough nut to crack, no one could figure out who he was.
派对上的神秘男人是一个难题，没有人能弄清他是谁。

5. The company's strict hiring process makes it a tough nut to crack for job seekers.
公司严格的招聘流程使得求职者难以进入。

6. Learning a new language can be a tough nut to crack, but with dedication and practice, it can be mastered.
学习一门新语言可能是个难题，但只要有毅力和练习，就可以掌握。