crack a hard nut
啃硬骨头(some of the most daunting challenges)
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啃硬骨头(the courage to tackle the hardest tasks)
但嵌入式计算是一块难啃的硬骨头。
But embedded computing is a tough nut to crack.
youdao
我还是让我的老板来啃这块儿硬骨头吧。
I'll let my boss crack this hard nut.
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