查询词典 difficult problem

Based on consider hereinbefore, this dissertation discusses several aspects on the problem of the sustainable and optimum exploitation of groundwater resources as follows:①reviewed entirely the origin and evolvement of the concept "sustainable development", stated and commented the study status in queue on"sustainable development"around national and international range, thorough discussed the science connotation about the concept "sustainable development";②looked back and commented across-the aboard some furthest basic concept and proposition related to groundwater resources, put forward self opinions on a few existent mistake points of view and chaos understandings;③expatiated entirely on the content and meaning of the theory of changeable groundwater resources system, contrast with the traditional methods of groundwater resources calculation and evaluation, combined example to show the application of this theory;④thorough analyzed the difficult and complexity to forecast the groundwater resources, fully stated the traditional methods of groundwater resources forecasting, pointed out the characteristic and applying condition of these forecasting method, introduced the main ideas and methods of wavelet analysis developed recently, and the MATLAB software be known as the fifths era computer language, and its accessory wavelet analysis toolbox, applied these methods and tools to analyze the groundwater dynamic curve, adopted the B-J method and Morte-Carlo method, combined with the theory of changeable groundwater resources system, discussed the new view on the forecast of groundwater resources;⑤synthetically analyzed the characteristics and limitations of the present all kind of groundwater manage model, combined mathematical programming, mathematical statistics, random process and the theory of variation system of groundwater resources on the unite optimum attempter of surface water and groundwater, emphasized how to make the model more nicety, more simple, more practicality;⑥analyzed the inside condition and outside condition to assure the sustainable and optimum exploitation of groundwater resources, the inside conditions are the follows: correct resources idea, scientific methods of resources calculation and evaluation, credible forecast methods of resources, exercisable measures of resources management, the outside conditions are the follows: the development idea of high layer, the transform of manage system, the matched policy and rule of law, the adjusted of economy lever, the improve of cultural diathesis, the boosting up of water-saving consciousness and detail measures, the control of population rising, the prevention and cure of water pollute, the renew and rebuild of ecology;⑦scan the sustainable and optimum exploitation of groundwater resources from the high level of metagalaxy, earth system science, and philosophy;⑧point out the more directions on groundwater resources.

它将为制定水资源的可持续发展目标和战略决策提供科学依据，为制定社会、经济可持续发展战略提供理论基础。基于以上考虑，论文主要从以下几方面对地下水资源可持续开发问题进行了比较深入的探讨：①全面回顾了&可持续发展&概念的由来与演变，对国内外&可持续发展&的研究现状进行了述评，并对&可持续发展&概念的科学内涵进行了深入探讨；②对涉及地下水资源的一些最基本的概念和命题进行了全面的回顾和评述，对目前仍然存在的一些错误观点和混乱认识提出了自己的见解；③全面阐述了地下水资源变值系统理论的内容和意义，并与传统的地下水资源计算评价方法进行了对比分析，结合实例具体说明了方法的应用；④深入分析了地下水资源预测预报工作的极端重要性和复杂性，对传统的地下水资源动态预测方法进行了全面的评述，指出了各类预测预报方法的特点及适用条件，对最近二十多年刚发展起来的小波分析技术的主要思想和方法及其应用范围，以及号称第五代计算机语言的MATLAB软件和附带的小波分析工具箱进行了介绍，并应用于地下水动态过程线的分析，采用时间序列中的B-J法，蒙特卡罗方法，与地下水资源变值系统理论相结合，探讨了地下水动态资料分析和地下水资源预测预报的新思路；⑤综合分析了现今各类地下水管理模型的特点及缺陷，将数学规划、数理统计、随机过程等与地下水变值系统理论相结合进行地表水地下水或多水源的联合优化调度，使模型更准确、更实用；⑥对保证地下水资源可持续开发的内部条件和外部条件进行了分析，内部条件主要是正确的资源观，科学的资源计算与评价方法，可靠的资源预测预报技术，可操作的资源管理措施，外部条件主要是高层发展思路、管理体制的变革、配套的政策法规、经济杠杆的调节、人文素质的提高、节水意识的增强及具体节水措施、人口增长的控制、水体污染的防治、生态的恢复和重建等；⑦从宇宙科学、地球系统科学及哲学的高度审视地下水资源的可持续开发；⑧指出了地下水资源可持续开发的进一步研究方向。

As you can tell, the autistic problem has a long way and difficult task to be accomplished in China.

由此可见，孤独症的问题在中国将会有很长的路要走，很大的工作要完成。

Due to the problem that the relative parameters of aviatic sensing image are often difficult to get, A line scan and data fitting method was presented in order to obtain whole gray change in image, and then to correct image vignetting phenomenon.

针对航空遥感影像在拍摄过程中相关参数不易获取的问题，提出了利用逐行扫描及数据拟合的方法来获取影像整体灰度变化情况，从而实现影像渐晕现象的复原。

For example, before my successful ascent of La Rambla I waited 5 hours! If the route has got an easy start I warm up on it and then I'm ready for the harder sections above. The problem comes if a route is difficult right from the start. And when I climb bouldery routes I rest for just one or two hours between one attempt and the next.

当我攀岩时，如果在热身活动时我觉得这条路线开头很容易，我就会充分准备一鼓作气拿下这条路线；相反，如果开始就让我觉得颇有难度，尤其是在攀一些漂砾路线时，我就会在每次尝试之间休息1、2个小时，养好精神再进行下一次。

It is a common problem to survey some boundary points in difficult area during the implementation of cadastral surveying.

地籍测量中对某些可望而不可及的界址点的测量是经常遇到的问题。

To the research of activity of cheeper science dug, we from check study proceed with, use design and directive case through work analyse and delibrate, will clarify we are opposite in the design in activity of cheeper science dug and guidance the understanding of the respect such as the design of the structural sex of the difficult easy degree of content of dug of mobile programming, cheeper, material, problem and think.

对幼儿科学探究活动的探究，我们从案例探究入手，通过活动设计和指导案例的剖析和研讨，来阐明我们在幼儿科学探究活动的设计和指导中对活动的程序设计、幼儿探究内容的难易程度、材料的结构性、新问题的设计等方面的熟悉和思索。

At last, in order to resolve the problem of required high degree of accuracy and very difficult to manufacture, the statistical tolerance law was adopted to design the key constructer's size chain, which may enhance the product's economic and technical performance.

作者采用统计公差分析关键结构的尺寸链，优化尺寸链设计，提高产品的技术经济性能。作者所作的研究和设计工作为高压共轨喷油器的开发和试制打下基础，为喷油器的改进提供理论依据。

Overuse has become a problem difficult to manage. Although "quality control" practiced in the past improved accuracy and duplicability of test results somewhat, existing problems are not solved.

5%， 过度服务已成为很难管理的问题，既往推行的&质量控制&工作在一定程度上提高和促进了检验结果的准确性和重复性，但并未解决已存在问题。

So: in medicine, long teeth should not be a big problem, apart from a very small number of "congenital ectodermal dysplasia," patients with this disease in addition (this is a including hair, fingernails will be bad at the same time development disease, it is not difficult to distinguish), one long tooth generic order speed may have differences, but president of the teeth.

所以：在医学上，长牙齿应该不是很大的问题，除了很少数的「先天性外胚层发育不良」这种病的患者之外（这是一种包括头发、指甲也会同时发育不好的疾病，不难分辨），通用人长牙的次序快慢可能有差别，但是都会长牙的。

But the reflection factor is in a standard filter important coefficient, but uses the alternative means to be very difficult to guarantee front and the retroreflection coefficient value is smaller than 1, and is unable to obtain its correlation function precisely, especially has this kind of serious problem in linear prediction coding equisignal processing, the BURG algorithm can in then be able to determine from the very beginning its exponent number and the transmittance have then overcome a limit question.

而反射系数是格型滤波器中的一个重要系数，而采用其他方法很难保证前向与后向反射系数的值小于1，并且无法精确得到其相关函数，尤其在线性猜测编码等信号处理中存在着这种严重问题，BURG算法能在一开始便能确定其阶数和传递系数便克服了着一限制问题。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。