The movement is a tough nut to crack.

葛兰运动是个棘手的难题。

Not a fan. - It's a tough nut to crack.

不喜欢 -选词神马的还真纠结。

Celtic have lost only once this season and will be a tough nut to crack.

【nut】凯尔特人队本赛季只输过一场，不好对付。

He may have softened a bit in his old age but he’s still a tough nut.

【nut】他年纪大了，可能已经变得温和一些，不过还是不好对付。

As part of human nature, people take risks or even people don't even understand what the risks are. And that is a tough nut to crack when you are dealing with it.

作为人性的一部分，人们承担风险，甚至人们甚至不了解风险是什么。当你处理它时，这是一个很难破解的螺母。