Some of these coats are hard—like the shell of a nut—for extra protection.
其中一些表皮很坚硬——就像坚果的外壳——可以提供额外的保护。
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。
Each has his own hard nut to crack.; Each has his own trouble.
各有一本难念的经。
一种难以寻找而且难以对付的坚果。
他是一个难对付的家伙。
To crack this hard nut, I would like to propose several practical recommendations as follows.
为解决这个难题，我想提出如下几点实用的建议。
Sudan was a hard nut to crack.
苏丹真的是难啃的骨头。
He 's surely a hard nut, nobody likes approaching him.
他确实是一个难对付的人，没有人喜欢接近他。
I know! He's a hard nut to crack.
我知道。他是个难以了解的人。
At that time, our teeth are good, hard pine nut shell, a Ke opened on!
那时候，我们的牙都很好，那么硬的松子壳，一嗑就开了！
我认识他，他是个感恩不化的人。
Employee turnover is a hard nut to crack for human resource management.
雇员离职是人力资源管理面临的一个棘手问题。
Position preposition is a hard nut of English teaching.
方位介词是英语教学中常碰到的一个难题；
The unit in translation is a hard nut to crack.
该单位在翻译是很难啃的骨头。
Mr. White is a hard nut to crack.
怀特先生是个难以对付的人。
But I don't like her boyfriend, Jack. He's a hard nut to crack.
但是我不喜欢她的男朋友，杰克。他是个难对付的人。
Jeff: This is indeed a hard nut to crack.
杰夫：这实在是一个棘手的问题。
He is really a hard nut to crack. You need to be more patient.
他是一个很难对付的人，你需要更多的耐心。
This problem is a hard nut to crack.
这个问题是块难啃的骨头。
她是一个难对付的家伙。
Actually, EST Reading is a hard nut for English teachers to crack.
然而，科技英语阅读教学是个难解的课题。
They say that she is a hard nut to crack.
据说她是一个难驯服的女人。
Filtering noise in the image signal has been one big hard nut to crack.
图像信号中噪声滤除一直是一大难题。
He is not only a troublemaker but also a hard nut to crack.
他这个人并不只很会惹麻烦也很难缠。
It is a hard nut for him to crack.
这对他而言是一个难题。
Mind you, she is a hard nut to crack.
小心，这是个难对付的女人。
I'll let my boss crack this hard nut.
我还是让我的老板来啃这块儿硬骨头吧。
It is a hard nut for him to crack.
这对他是一个难题。
They will be a hard nut even for the brains of the most erudite people.
他们将是一个难题，即使是大脑最博学的人。
They will be a hard nut even for the brains of the most erudite people.
他们将是一个难题，即使是大脑最博学的人。
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