Michael Jackson appears to be a tough nut to break.
迈克尔·杰克逊似乎是一个颇为棘手的问题。
This is a tough nut to crack. It's going to take some time to figure out.
这是一件棘手的事。要花些时间才能想出来。
My new boss is a tough nut to crack. I never know if he's pleased with my work.
我的新老板是个很难相处的人。我永远也不知道他是否对我的工作满意。
There are some promising drugs in the pipeline. But it's been a really tough nut to crack.
有一些前景不错的药品已经在研发之中，但要真正实现确实还很不容易。
Of course, cracking new chip markets isn't easy, and the cell phone business may prove an especially tough nut for Intel.
开发新的芯片市场当然不是件容易的事，手机业务尤其困难，可能会成为英特尔面前的一块硬骨头。
Of course, cracking new chip markets isn't easy, and the cell phone business may prove an especially tough nut for Intel.
开发新的芯片市场当然不是件容易的事，手机业务尤其困难，可能会成为英特尔面前的一块硬骨头。
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