tough nut to crack

基本解釋

eg: It is a tough nut for him to crack.
這對他而言是一個難題。
My new boss is a tough nut to crack. I never know if he's pleased with my work.
我的新老板是個很難相處的人。我永遠也不知道他是否對我的工作滿意。
So I think Iran is always going to be a tough nut to crack, but I think it is worth a try.
另外，他們剛剛發(fā)射了第一顆衛(wèi)星。因此我認為，伊朗和以前一樣，還是一顆硬釘子，不過值得去努力。

All the same, Florida looks a tough nut to crack for any Democrat.
ECONOMIST: Two big ’gators pounding away The
Although it is a tough nut to crack, Pakistan is poor because the military is rich and in power and until that changes it is pointless to expect better days.
ECONOMIST: Mulling Musharraf