what makes the brain such a tough nut to crack?

是什么让大脑成为如此难砸的死硬坚果？

the cultural connotation and wide-usage of idioms in the literary works have made their translation a tough nut to crack.

习语有着丰富的文化内涵，在文学作品中应用广泛。

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。

of course, 」mastery「 is a tough nut to crack!

当然，「征服」是把一个强硬的坚果弄碎！

but embedded computing is a tough nut to crack.

但嵌入式计算是一块难啃的硬骨头。

so i think iran is always going to be a tough nut to crack, but i think it is worth a try.

另外，他们刚刚发射了第一颗卫星。因此我认为，伊朗和以前一样，还是一颗硬钉子，不过值得去努力。

eg: it is a tough nut for him to crack.

这对他而言是一个难题。

actually, this article is a compilation of my experience of what works and what doesn」t work in the world of love, at least for me. love is a tough nut to crack.

实际上这篇文章只是我的经验总结，关于在爱情世界里什么有用什么没用——至少对我来说。

and so this is going to be a tough nut to crack.

所以这将会是一项棘手的任务。

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。

sunday」s match will be a tough nut to crack.

周日的比赛将是场硬仗。

that is a tough nut to crack, and all chelsea have managed this season is to prove ferguson correct when he suggested they were the ones with the age problem if a significant improvement was expected.

对切尔西兰说，弗格森是一根难啃的骨头，本赛季切尔西所做的一切只是证明了弗格森的正确，爵爷曾表明如果切尔西想在日后获得显着的提高，教练的年龄是一个阻碍发展的因素。

it was however an important contrast to scolari's only home encounter with hull city who again proved a tough nut to crack.

无疑，这场比赛是和斯科拉里主场遭遇赫尔城一战的重要对比，赫尔城再一次证明了自己是根难啃的骨头。

this is a tough nut to crack.

这是一件棘手的事。