出生率

In fact, I ran into a really hilarious article by a U.S. Baptist writer who worried that the Baptist birthrate is going down while the Nazarenes are having babies at a rate of three-plus per woman.

事实上，我曾经看到一篇真的可以笑死你的文章，那是一个美国浸信会作家写的，他在担心浸信教徒的出生率正在下降--其实拿撒勒人力每个妇女都在生3个以上的孩子。

Professor Jung said South Korea's consistently decreasing birth-rate gave her students fewer chances to watch and practice delivering babies, making Noelle's presence necessary.

Jung教授指出，韩国不断下降的人口出生率让她的学生观察和练习接生的机会越来越少，所以诺艾尔的存在是很有必要的。

And control problems such as optimal import rate control, optimal harvesting control, optimal birth control are investigated. By means of nonlinear functional analysis, differential equations, integral equations, and modern control theory, a number of research results are obtained, which are theoretically valuable and provide a solid ground for the practical use of our models.

本文系统讨论了几类年龄依赖的单种群和多种群动力系统，综合应用非线性泛函分析、微分方程、积分方程以及分布参数系统控制论等理论与方法，深入地研究了这些系统的解的存在性、唯一性以及非负有界性；研究了这些种群动力系统的最优输入率、收获率和出生率控制问题，获得了一批重要的理论成果。

By using center manifold theorem and normal form of maps, we also present formal proofs of the supercritical flip bifurcation at the bifurcation point. Above this threshold, there is a characteristic sequence of bifurcations, leading to chaotic dynamics, which implies that the dynamical behavior of the single species model with birth pulses are very complex.

利用单参数族映射的中心流形定理、正规型和指数积分函数的性质，得到了具非线性出生率或具密度依赖成熟率的混杂矩阵模型正平衡态的存在性和稳定性、超临界分支以及各种复杂现象甚至混沌。

Nugent says statistics on the fertility rate were also revealing.

Nugent说人口出生率的统计数据也揭示了这一点。

Nugent says statistics on the fertility rate were also revealing . Most developing countries have what we call a youth bulge , which means that they still have a very large number of young people.

Nugent认为关于的出生率的数据仍然是有启迪性的，她说：大多数发展中国家存在一个我们称之为'青年膨胀'的现象，即青少年人口过多。

The noise made by cars disturbs the residents living on both sides of streets all day and night.

普遍认为，在发达国家人口增长的主要原因与其说是出生率的上升，还不如说是由于医疗保健的改善的使死亡率下降了。

And since the Planned Parenthood policy as a basic national policy has been put into practice for more than 20 years, the last few years start to see the result.

不仅在城市，而且在农村人口出生率也开始逐年下降。学龄儿童锐减必然会给我国教育事业的发展带来一些新的管理问题。

By 1990, both birth and death rates had fallen precipitously and life expectancy had risen.

到了1990年，出生率和死亡率急剧下降，人均寿命有所上升。

Secondly, this paperalso uncover the competitive, cooperative, parasitical and predacity relation betweenBlog unit, colony as well as that of unit and colony.

所以，本研究借鉴了生态学的物种及种群的分析框架和有关成果，在此基础上，首先通过对Blog生态位、生态因子、生态型、生态数据的描述建立了这样一个物种体系，继而对Blog物种的种群特征如年龄结构、出生率和死亡率、数量发展曲线和种群波动等进行了分析和诠释，描绘出一个Blog的种群系统。

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。