对于那些使用恒定的冰川融化的水作为饮用水的数百万人来说，冰川面积不断缩小是一个难题。
Shrinking glaciers are a problem for million is of people who use regular glacier melt for drinking water.
美国有一个问题，通常只有有钱人家的孩子才能去最好的学校上学，而这实际上是一个难题。
We have a problem in the United States that usually only wealthy kids go to the best schools and it's kind of a problem actually.
从技术角度看，可伸缩性是一个难题。
为显示提供信息的动态国际化是一个难题。
Providing dynamic internationalization of information for display is a difficult problem.
当靶子用光了，新靶子的进口是一个难题。
When the targets run out, importing fresh ones is a problem.
这对欧佩克是一个难题。
键选择：多维数据建模中的键选择是一个难题。
Key selection: Key selection in multidimensional data modeling is a difficult issue.
测算油气井开采过程中逸散的天然气量是一个难题。
Measuring the amount of natural gas that is leaking during drilling is one challenge.
这对他而言是一个难题。
这对他而言是一个难题。
然而时机是一个难题。
二杀手渴望看到的动物，是一个难题找到他呢？
Killer eager to see the creature is a conundrum to find him?
这实在是一个难题，并且我敢说你们中的一些人也为其所困。
It is a very difficult question and I daresay that some of you have been troubled by it.
托尼：你说钱是一个难题。我猜想你是另有所指。
Tony: you say money is one problem. I suppose you mean there are others.
在市场环境下，网损如何公平地分摊是一个难题。
The fair allocation of network losses is one of hard problems in the market environment.
复杂系统多故障诊断的计算复杂性一直是一个难题。
Computational complexity of complex system multiple fault diagnosis is a puzzle at all times.
该如何引导医学生树立良好的职业道德是一个难题。
It is a puzzling problem how to guide medical students to build up an appropriate professional morality.
大容量灯泡贯流式水轮发电机组管型座安装一直是一个难题。
The installation of tube pedestal of large-capacity bulb tubular hydro-generating unit is always a difficult problem.
图像中低信噪比点目标检测与跟踪，从理论上讲是一个难题。
To a point target there is no extent information can be used.
有时候，通过大型模型导航并找到一个对象和另一个之间的关系是一个难题。
Sometimes, navigating through a large model and finding relationships between one object and another becomes a challenge.
这显然是一个难题，但我们有一个关于从哪里开始一些新的想法。
This is obviously a hard problem, but we have a few new ideas about where to begin.
在高温天气如何保证要求高的大体积混凝土的施工质量是一个难题。
It is a difficulty to guarantee the high quality for bulk concrete construction in the high temperature weather.
因此如何预测路基的沉降是一个难题，也是岩土工程界的热点之一。
So how to predict the settlement of the roadbed is a problem and one of the hot of the geotechnical engineering.
中文信息处理中，判断哪些词串该入选《分词词表》一直是一个难题。
During Chinese information processing, judging which word strings should be in participle list is always a difficult problem.
在较小的机器上，添加磁盘和控制器可能是一个难题，还可能需要购置一个扩展单元。
On smaller machines, adding disks and controllers may be a challenge and may also require the purchase of an expansion unit.
对于非线性问题，通常存在多稳态解，如何求解系统所有的解是一个难题。
However, it is difficult to obtain all the steady state solutions for a given system.
例如，或许太天真的是一个难题，但是渴望轻松和相信他人真的是一件坏事吗？
For example, perhaps being too naive is a problem, but is it such a bad thing to want to be able to relax and trust others?
对伊朗实行制裁是一个难题，因为他们不会因此停止计划，如果你怀疑，他们将加快进程。
Imposing sanctions [on Iran] is a problem because they will not stop the program and they will accelerate it if you are suspicious.
对伊朗实行制裁是一个难题，因为他们不会因此停止计划，如果你怀疑，他们将加快进程。
Imposing sanctions [on Iran] is a problem because they will not stop the program and they will accelerate it if you are suspicious.
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