难以

Simulation of natural phenomena has always been one of the most difficult tasks in computer graphics.

对自然景物的模拟一直是计算机图形学中最难以解决的问题之一。

With the result of analyzing the Greedy Algorithm, an local area encrgy term is defined and added to the target function for capturing the image feature in a wider region and guiding the deforming curve into the concave regions.

传统的参数活动轮廓模型分割图像时，要求初始轮廓线设置在感兴趣区域的边界附近，曲线在变形过程中难以分割深度凹陷区域。

And almost all of us have some sort of difficulty in the concentration of our attention.

几乎所有的人都有一种难以集中注意力。

ABSTRACT Concentrator design is a kind of complicated work.

选矿厂设计是一项较为复杂的工作，传统的手工设计方法已难以适应今后的发展趋势。

The operating system curriculum's content is the synthesis of each type operating system's composition structure, the design concept, the design method and the theory, Therefore, this curriculum knowledge is more, conceptive is strong and is abstract, all of those make the student feel that it is not easy to understand and grasp in the study process.

操作系统课程的内容是各种类型操作系统的组成结构、设计思想、设计方法和理论的综合，所以，该课程知识点多、概念性强而抽象，使学生在学习的过程中往往感到不易理解、难以掌握。

Star effects and conceptualization of the concept they are difficult to move.

明星效应和务虚的概念，都难以将他们打动。

The combination of the two categories it possible to conceptualize four conversion patterns.

隐性知识的这个认知层面虽然难以明说，但却深深的影响我们对这个世界的看法。

It does appear have a darker tail tip rather than a concolorous tail, but the tip is so indistinct that it is perhaps difficult to be sure whether it is Indian or not.

它确实看起来有较暗的尾尖，而不是同色的尾部，但这尖端是如此模糊，所以恐怕难以断定它是否为四声杜鹃。

Methods for feature space discretization based cluster algorithm and class conditional probability distribution estimation are proposed.

首先针对应用贝叶斯决策理论时难以估计类条件概率密度函数的问题，提出了特征空间离散化及相应的类条件概率分布的估计方法。

So our experiments offer a unique window into confabulation (the story-telling we do to justify things after the fact) that is otherwise very difficult to come by.

因此，我们的实验为观察"虚构理由"（指人们在事后虚构理由为自己的决定辩护的行为）提供了一个独特的窗口，而这是用其他方法难以得到的。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷