当我们碰到难题时可以说 a tough(or hard) nut to crack – 特别难打开的坚果。这个表达也能用来形容一个难以对付或难理解的人。
- My new boss is a tough nut to crack. I never know if he‘s pleased with my work.
- How can we increase sales during a recession? That‘s a tough nut to crack!
值得注意的是，表达 use a sledgehammer to crack a nut 用大锤来敲开一粒小坚果，实际意思是杀鸡用牛刀，小题大做。
- The police sent five officers to arrest one teenage thief? That‘s really using a sledgehammer to crack a nut!
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