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。
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。
This problem is a hard nut to crack.
这个问题是块难啃的骨头。
Jeff: This is indeed a hard nut to crack.
杰夫：这实在是一个棘手的问题。
Jeff: This is indeed a hard nut to crack.
杰夫：这实在是一个棘手的问题。
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