Don't Feel Guilty for Problems that are not of your Own Making: Oneof the most difficult aspects of work is dealing with customercomplaints.

不要因为集体失误而产生负罪感：单位中最困难的工作之一应该是处理客户的投诉。

youdao

Also, he notes, the most difficult problems are always the most expensive to solve, which makes challenging projects less attractive if they’re judged by their “bang-for-the-buck” efficiency.

另外，他也指出，最大的困难就是按照“货真价实”的标准判断，最费钱的项目就变得不那么令人心动了。

youdao

But for the most part, scientists do not understand the underlying biological problems behind Alzheimer's, making it difficult for doctors to treat, let alone cure.

但是，大体来说，科学家对阿尔茨海默氏病潜在的生物学问题仍不了解，这给治疗变得困难，更不用说治愈了。

youdao

It is an exciting moment for Yemen, as the Yemeni people come together to resolve some of the most difficult problems that have held their country back, write a new constitution, and build a new future.

WHITEHOUSE: Our Top Stories