mr. white is a hard nut to crack .

怀特先生是个难以对付的人。

how to evaluate the value of the software product is a hard nut to crack for software product designer and user.

如何评价软件产品的价值是困扰软件开发商和用户的一个难题。

in english skill training for listening, speaking, reading and writing, listening takes an important position, yet it is also a hard nut to crack in english language learning.

在英语「听、说、读、写」技能训练中，听占有重要的地位，但这也是在英语学习中不易突破的一个难关。

all the candidates are very excellent. it「s indeed a hard nut to crack to choose the best one.

译文：所有的候选人都非常的优秀，要从中选出最好的一个的确是件很难的事。

while how to make oral english lessons effective and how to improve the student」s oral communication competence has always been a hard nut to crack in the teaching of english.

如何上好口语课，如何培养学生的口头交际能力历来是英语教学上的难题。

the project of a bank office building in a special urban environment provides a hard nut to crack but also a chance to challenge a new form.

一幢在特定都市环境中的银行大楼设计，给设计者提出了苛刻的设计条件，同时也提供了创造新形式的机遇。

a hard nut to crack and find!

一种难以寻找而且难以对付的坚果。

how safety, develop efficiently the petroleum resources is a hard nut to crack to put in the petroleum industry in front.

如何安全、高效地开发石油资源是摆在石油工业面前的一道 难题。

the assignment and grading of open test questions in maths has been a heated topic that arouses a lot of attention and a hard nut to crack in the current curriculum research and evaluation.

初中数学开放性试题的设计和评价是当前新课程研究中的热点和难点。

how to utilize the six olympic venues appropriately will be a hard nut to crack for the beijing government and the six universities.

奥运会结束后如何妥善利用这六座高校奥运场馆已成为北京市政府、六所高校以及相关人员最为棘手的问题。

when smelting and aluminum alloy that the founding is mutually related, a hard nut to crack that metallurgy technology is first of all encounter is adjust clean degree the rigorous demand.

熔炼和铸造相关的铝合金时，冶金工艺首先遇到的难题是对纯凈度的严格要求。

they say that she is a hard nut to crack .

据说她是一个难驯服的女人。