无法克服的障碍

For some people, James noted, this challenge is never overcome; such people only get their work done "in the interstices of their mind-wandering."

James说，有很多人是无法克服这种障碍的；这些人只能在他们思维不断跳跃的同时完成他们的工作。

But it is not an obstacle that cannot be overcome.

但它不是一个无法克服的障碍。

Therefore,it is necessary to research diffusion equation for suspended sediment because it describes the sediment move process in the water body.The equation is a various coefficients second-order linear partial differential equa-tion,such equation under complex boundary condition is very difficult to get its analytical solution,while its numerical solution relative analytical solution is more easier and has the obvious superiority:simple,the computation convenience.but to get a kind of difference format which is good accuracy and stability is not easy.

泥沙扩散方程实际上是一个变系数的二阶线性偏微分方程，这样的方程在各种复杂边界条件下求解是十分困难的，求它的解析解在数学上存在着难以克服的障碍，无法求出其精确解，因此常用数值方法求它的近似解，相比较而言，数值方法有着明显的优势：即简单灵活、计算方便快捷，但要寻找一种精度高、稳定性好、计算方便的差分格式也并非易事。

Based on the above problems, the writer believes that the theory of animal's right or the theory of animal's subject status exists some obstacles which are unvanquishable either in theory or practice, but we couldn't ignore the animal's protection in the law, at the same time we should try to achieve the harmonious relationship between humanity and the nature.

针对以上问题，笔者认为动物权利论和动物主体论在理论与实践中均存在无法克服的障碍，但是也不能忽视对动物的法律保护，应努力实现人与自然的和谐共处。

The "aesthetic emotion" springs from an intellectual triumph, from overcoming barriers of word-bound thought and achieving insight into literally "unspeakable" realities

&审美情感&来源于智力的胜利，从克服障碍的字面的方向的思想来实现洞察字面上&无法形容&的现实。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。