Reducing demand has been difficult.
事实证明，降低需求非常困难。
Demonstrating that has been difficult.
证明这些是很困难的。
Even within New York City, travel has been difficult.
即使在纽约市里，出门也很困难。
It has been difficult to gauge the human impact of the accident.
这次事故对人类的影响难以估量。
An answer to the first of these has been difficult to obtain.
关于第一问题的答案是很难获得的。
But they insist that is not the case and the decision has been difficult.
但是她们坚称，不是这么一回事，这是个艰难的选择。
But it has been difficult to pin down the exact relationships between them.
但要准确定义它们之间的关系还是有困难。
That requires industry-wide cooperation, which has been difficult to achieve.
这要求整个行业进行协作，但通常很难办到。
The theory of public administration has been difficult to describe the pillar.
公共行政的理论已经很难描述的支柱。
Fixing this problem has been difficult, in part because its causes are so complex.
解决这一问题一直很难，部分是由于其原因的复杂。
And until recently, it has been difficult to model that complexity in the laboratory.
直到最近，这种复杂的关系还难以在实验室中模拟出来。
That story made bad publicity for us and, frankly, it has been difficult for us since.
这事大家都知道了，坦白说，从那以后，比赛对我们来说很困难。
The simple via connection has been difficult to achieve high-quality signal transmission.
因此简单的过孔连接已经难以实现高质量的信号传输。
Hitherto, it has been difficult to find the truth against the background of false information.
至今为止，一直以来在充满错误信息的局面中很难发现真相。
It's very difficult to demote somebody who has been filling in during maternity leave.
给替代歇产假的人降职是很难的。
This year has been a particularly difficult one for NASA.
对于美国航天航空局来说，今年是特别艰难的一年。
Concurrent programming has always been difficult and continues to be difficult.
并发编程总是很有难度，而且一直会很难。
This year, though, has been a particularly difficult one for NASA.
然而，今年成了对国家航空航天局而言尤其困难的一年。
Of course this has been a difficult and often unpleasant year in the markets.
当然，市场这一年处境艰难、常常令人不快。
Rarely before has it been so difficult for Japan to control its currency.
以前日本很少有像现在这样难控制本国货币的局面。
We always knew it would be difficult, but this past week has definitely been a hard one, for all of us.
我们一向清楚，这条道路将是困难的，而对我们所有人来说，刚过去的这个星期无疑是艰难的。
But it is not difficult to go beyond what has been discussed in art history.
然而，要往超出这些艺术史的讨论之外了说也不难。
This has been a difficult time and a very special situation.
这是一个困难的时期，也是一种非常特别的情况。
Converting data from one format to another has always been a difficult task.
将数据从一种格式转换成另一种格式总是一个很困难的任务。
The relationship between fruits and vegetables and cancer prevention has been more difficult to prove.
水果和蔬菜跟预防癌症之间的关系已经变得更难去证明了。
The position of women in the Arab world has long been difficult.
妇女在阿拉伯世界中的地位长期以来一直无足轻重。
Why has it been so difficult for them to communicate?
为什么他们变得这么难以沟通？
Why has it been so difficult for them to communicate?
为什么他们变得这么难以沟通？
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