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A predator model with refuge and toxicity is studied. By constructing a suitable Dulac function, it is shown that there is no limit cycle in the first quadrant, thus the globally stability of the equilibrium is proved. Further more, the paper analyzes the influence of refuge, toxicity and harvesting. It is amazing that ① if the death rate of predator is big or the harvesting effort is big, the existence of the predator is unrelated with refuge; if the death rate of predator and the harvesting effort are small, and the refuge is small enough, the population of both species is increased as the increase of refuge;② if d2=0, the increase of d1 has no influence on the prey population, while the population of predator is decreased.

研究一类有避难所、毒素作用和外界捕获影响的捕食系统，通过构造恰当的Dulac函数，证明系统在第一象限没有极限环，从而证明了平衡点的全局稳定性；分析了避难所、毒素、捕获作用对该系统最终种群数量的影响，发现：①当捕食者的死亡率大或其被捕获得多时，两种群的绝灭与避难所的存在无关；当捕食者的死亡率小、被捕获得多且避难所足够小时，随着食饵避难所的增加，捕食者种群数量也随之增加；②当毒素d2=0时，毒素d1的增加对食饵种群最终数量没有影响，而使捕食者种群数量下降。

In the paper, a mathematical model of quadrant detector output signal was established by light energy integral.

通过光能积分建立象限探测器输出信号数学模型，分析了输出信号线性特性与光斑和光敏面半径比、信号采样精度、象限间光电特性均匀性等之间的关系，给出对应探测器输出最优线性特性的光斑和光敏面半径比值，采用分段线性化方法拟合探测器输出特性参数。

Consider the actual meaning of the system, we are mainly interested in the dynamical behaviour of the system in the first quadrant.

根据问题的实际意义，我们主要感兴趣的是系统在第一象限内的动力学行为。

When I first meet a new person, the size of the opening of this first quadrant is not very large, since there has been little time to exchange information.

当我第一次遇到一个人的时候，这个公开的第一象限面积并不太大，因为交流信息的时间不多。

These points would be scattered throughout the first quadrant.

这些要点将分散在第一象限。

This principle is illustrated in Fig. 5, where the shaded region represents the region of increased margin for the data symbol in the first quadrant.

这一项原则在图 5 中被举例，阴暗的区域表现区域哪里增加边缘为数据符号在那第一个四分圆。

The layout of Web page had significant effect on first fixation in different quadrant of the same layout instead of first fixation distributing.

2不同网页布局首视点分布的象限差异不显著，但在同一布局下不同象限的首视点分布差异显著。

During his first mission to the Alpha Quadrant , the Doctor was instrumental in establishing contact with Starfleet .

由於医生能被载入与星联建立起来的连接中，他被派去执行他在Alpha象限的第一个任务。

Bus mobile TV, because of its huge audience and the number of "forced ratings" features, from the date of birth on the natural way to reach audiences with higher rates in the first quadrant IV of the competitive advantage of the monopoly of its operating strategy therefore focused on the improvement of audience loyalty.

公交移动电视，由于其数量巨大的受众和"强迫收视"的特点，从诞生之日起，就天然地拥有较高的观众到达率，处于第IV象限的垄断竞争优势所以其运营策略主要集中在观众忠实度的提高。

While there has no control, the behavior of the system is discussed in Chapter 3. No defines in the point (0,0) of the system brings much difficulties in the research on the kinetic nature near (0, 0). By applying the series theories and methods in the literature on the singular point of nonlinear equations, we solve this problem satisfactorily and give the all possibility of the orbits of the system converging (0,0) as t→+∞ in the First Quadrant.

因为系统在(0，0)点处没有定义，这给研究其在(0，0)附近的动力学性质带来了困难，我们应用文献中关于研究非线性方程奇点的系列理论和方法，圆满解决了这一问题，给出了第一象限当t→4+∞时，在全参数状态下系统的轨线趋于(0，0)点的所有可能情况。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。