a hard nut to crack 棘手的问题 ; 难以处理的问题 ; 难以对付的人 ; 难对付的人
Sometimes, it is a hard nut to crack without an expert's help.
有时候,如果没有专家的帮助,这是一件很难解决的事情。
The problem of hunger worldwide is a hard nut to crack. I'm afraid that scientists need to put in more efforts.
全球性的饥饿问题是个棘手的问题,恐怕科学家们需要付出更多的努力。
Building such a bridge over the bay was a hard nut to crack but the local government made it within two years.
在海湾上建造这样一座桥是一件困难的事情,但当地政府在两年内完成了。
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