出生率

Differing from the former studies, the growth rate is extended to be a general continuous function.

与以前的研究成果所不同的是，将出生率函数推广到了一般连续函数，通过运用一些运算技巧，得到了比文[14]更好的结果。

The decrement of death rate is one of factors that result in population incresment besides the raising of birth rate.

除了出生率的上升和移民人数的增加，死亡率的下降也是人口增长的一个因素。

Some of this is the result of immigration and rising longevity but, according to David Coleman, a demographer at Oxford University, the recovery is also the result of older women having more children "almost sufficient to compensate for the sharply reduced birth rates of younger women".

一部分是移民和长寿的结果，然而，正如牛津大学人口学家David Coleman所说，恢复也是高龄妇女生更多的孩子"几乎有效地弥补了年轻妇女的急剧降低的出生率"的结果。

Speaking of demographic factors , the important ones are population size and its density, birthrate and distribution of ages.

说到人口因素，重要的是人口数量、密度、出生率和年龄分布。

Second, we consider the strongly coupled elliptic system with homogeneous Dirichlet boundary conditions. The prior estimates for thesolution of nonlinear elliptic system are derived. It is shown that there is no coexistence state if diffusion rates are strong, or if the intrinsic growth rates are slow.

第二章研究带齐次Dirichlet边界条件的强耦合椭圆系统，首先推出非线性椭圆系统解的先验估计，然后证明了当食饵和捕食者的扩散率足够大，或者出生率足够小时，系统不存在共存现象，并给出半平凡解存在的充分条件。

Birth rates are often low, however – leaving fewer children to look after parents in their dotage and a smaller workforce to pay the taxes that also support them.

然而，出生率普遍很低，导致照料老人的子女减少，纳税供养老年人的劳动人口下降。

But I doubt we'll become a nation of reclusives, the more we live in ones and twos, the more herd instinct will assert itself.

随着出生率的快速下降，将有更多的人不得不习惯于这种生活方式。但我怀疑我们会成为一个孤独者的民族。

Then we researched the existence of periodic solution of order one of this modified model by using theories of invariant set of impulsive semi-dynamical system and Brouwer\'s fixed point.

第三章考虑了一类具有非线性传染力函数的传染病模型，其中人口出生率和死亡率相同并且患病者病愈后可自然获得免疫但一段时间后免疫力也会自然丧失。

The mysteries of birth and death, the lapse of conscious life during sleep and in swooning, even the commonest operations of imagination and memory, which abstract a man from his bodily presence even while awake-all such facts invincibly suggest the existence of something besides the visible organism, internal to it, but to a large extent independent of it, and leading a life of its own.

奥秘的出生率和死亡率，失效意识到生活在睡眠和swooning ，甚至最常见的行动的想像力和内存，摘要一名男子从他的身体存在，即使醒著，战无不胜所有这些事实表明，存在著一些除了可见的有机体，它的内部，但在很大程度上是独立的，并领导自己的生命。

Reducing fertility rates would be advantageous, especially in LDC's.

降低出生率在不发达国家尤其重要

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。