持久

We gain conditions for persistence for three-species of the system and global asymptotic stability for positive periodic solution of the system.

研究了一类具有扩散系数和 Holling 类功能反应的一捕两食三种群非自治捕食系统，得到了系统持久生存和周期系统存在唯一全局渐近稳定的周期解的条件。

With the help of comparison theorem, sufficient conditions which guarantee permanence of the system are obtained. For the almost periodic case, by constructing a suitable Liapunov function, we obtained that the system has a unique globally asymptotically stable positive almost periodic solution. Finally, we study a multispecies predator-prey system with stage structure and Holling II type functional response.

第二部分考虑具有阶段结构的非自治扩散捕食系统，利用比较定理得到该系统持久生存的充分条件，其后在概周期情形下通过构造合适的Liapunov函数得到了保证该系统存在唯一一个全局渐近稳定的概周期解的条件。

Alfred stayed there for a week before returning to Athelney.Alfred stayed in the camp a week before he returned to Athelney.

他集结在那里的军队和丹麦大军相比是微不足道的，然而，阿尔弗雷德断定，丹麦人已不再适应持久的战争，他们的军需供应处于无组织状态，只是靠临时抢夺来维持。

Matter how strong you are how notable your attainments, you have enduringsignificance only in your relationship to others.

不管你有多么强大、你的成就多么辉煌，只有保持你与他人之间的关系，这一切才会有持久的意义。

No matter how strong you are how notable your attainments, you have endruring significance only in your relationship to others.

不管你有多么强大、你的成就多么辉煌，只有保持你与他人之间的关系，这一切才会有持久的意义。

In this paper,the asymptotic property for two kinds of ecological systems and oscillation for solutions of a neutral differential equations is studied by employing differential inequalities and using eigenvalue analysis,iterative algorithm,induction and comparison theorem etc.Here, the system\'s asymptotic property includes the uniform persistence,the global attractability of the solutions,the asmptotic stability of the solutions and the oscillation of solutions.

本文利用微分不等式、特征根分析法、迭代法、归纳法及比较原理等方法和理论，研究了两类生态模型解的渐近性和一类脉冲中立型微分方程解的振动性，其中包括模型的一致持久生存性，正平衡态的全局吸引性、局部与全局渐近稳定性以及解的振动性。

The asymptoticbehavior of two ecological systems and the unconditionally stability and oscillations in kinds of 4-order delay difference equations are investigated by using analysis method, constructing Lyapunovfunctions, the logarithmic norm, charateristic roots theory and the bifurcation theory. Here, theasymptotic properity includes the uniform persistence, the global attractability of the solutions,the asymptotic stability of the positive solution local or global and the oscillations of solutions.

本文利用定性分析的方法、比较原理、特征值分析法、对数范数、构造Lyapunov函数及分支理论等方法和理论，研究了两类生态模型解的渐近性及一类四阶时滞微分方程解的无条件稳定性，其中包含模型的一致持久生存性、正平衡态的全局吸引性、局部和全局渐近性以及解的振动性等问题。

I am thinking of aurochs and angels, the secret of durable pigments, prophetic sonnets, the refuge of art.

我正在想欧洲的野牛与天使，颜料持久的秘密，预言家的十四行诗，艺术的避难所。

I am thinking of aurochs and angels,the secret of durable pigments,prophetic sonnets,the refuge of art.

我现在想到欧洲野牛和天使，想到颜料持久的秘密，想到语言性的十四行诗，想到艺术的庇护所。

The above image was taken in an effort to capture the sense of wonder one gets when watching an auroral display.

在一个宁静的夜晚，苏必略湖远端的地平面笼罩著一片持久不散的弥漫绿色极光。

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。