hard nut to crack的意思|示意

A: I don't understand Mr. Chen. He never smiles or laughs. B: I know! He's a hard nut to crack.

熏a：我真不理解陈先生。他从来不笑。B：我知道。他是个难以了解的人。

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

各有一本难念的经。

Mr. White is a hard nut to crack.

怀特先生是个难以对付的人。

I know! He's a hard nut to crack.

我知道。他是个难以了解的人。

Shaping of double curved face lamella has been hard nut to crack in manufacture trial work.

在汽车车身试制领域，双曲面薄板零件的成形一直是试制工作的难题。

I never know Bill very well. He was not very communicative and always seemed to me a hard nut to crack.

我从来就不太了解比尔，他不太爱说话，我总觉得他这个人很难对付。