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1·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。

2·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。

3·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。

4·Each has his own hard nut to crack.; Each has his own trouble.

各有一本难念的经。《新英汉大辞典》

5·A hard nut to crack and find!

一种难以寻找而且难以对付的坚果。

6·Sudan was a hard nut to crack.

苏丹真的是难啃的骨头。

7·I know he, he is a hard nut.

我认识他，他是个感恩不化的人。

8·I know! He's a hard nut to crack.

我知道。他是个难以了解的人。

9·Mr. White is a hard nut to crack.

怀特先生是个难以对付的人。

10·He's a hard nut to crack.

他是一个难对付的家伙。