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.
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.
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.
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.
川西致密砂岩气藏压裂井的生产历史拟合是一个难题。
The production history simulation for artificially fractured wells in the tight sandstone gas reservoir in west Sichuan is a difficult problem.
如何有效地从人脸图片中提取人脸特征一直是一个难题。
It is still a difficult problem to extract features from face images efficiently.
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.
在轧辊的磨削过程中，复杂辊形轮廓曲面的形成是一个难题。
In course of grinding roller, it is a problem generating the complex profile of roller.
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.
复杂环境条件下，超深超大基坑施工对周围环境的保护是一个难题。
Under complex environmental conditions , it's a difficult problem to protect the surrounding environments in the construction of super - deep and super - large foundation pits .
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.
在对恶意代码的研究上，恶意行为规范的自动生成仍然是一个难题。
On the study of malicious code, the automatic generation of malicious behavior speciation is still a difficult problem.
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.
水位流量关系的确立是一个难题，利用曼宁公式求解会产生较大误差。
To establish relationship between water level and water flow is a difficult problem, and to solve by using Manning's formula will engender fairly great error.
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.
亩产量研究历来是一个难题，一是文献中亩产记载较少，而且多是约数。
Yield per mu is always a problem of, first documented in the literature per-mu yield less, but more are approximate.
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.
在电液比例阀和电液伺服阀动特性测试中，高频动态流量的测量一直是一个难题。
The measurement of high frequency dynamical flow in dynamical test of electro-hydraulic proportional valve and electro-hydraulic servo valve is very difficult.
套管强度性能受多种因素的影响，如何确定套管强度余量及其大小，是一个难题。
Since casing strength performance can be influenced by many factors, it is hard to confirm casing strength margin and its value.
配电线路单相接地故障的检测和定位是一个难题，要在线路上定位故障点更是困难。
Detecting and locating the single phase grounding fault of power distribution system is difficult, to locate fault in the circuitry is more difficult.
DC开关变换电路是一个时变的、非线性的动态系统，它的分析与设计一直是一个难题。
DC-DC switching converter is a time-variant and non-linear dynamic system, and it is difficult to analyze and design.
管理髌骨疼痛已不再是一个难题，如果治疗师可以判断基本致病因素和解决这些因素的治疗。
Management of patellofemoral pain is no longer a conundrum if the therapist can determine the underlying causative factors and address those factors in treatment.
管理髌骨疼痛已不再是一个难题，如果治疗师可以判断基本致病因素和解决这些因素的治疗。
Management of patellofemoral pain is no longer a conundrum if the therapist can determine the underlying causative factors and address those factors in treatment.
应用推荐