查询词典 over-population problem

Logistic single population model is important for studying the increasing laws of the biological population in limited space.

Logistic单种群模型是研究有限空间内生物种群增长规律的重要数学模型。

One of the theoretical issues arising from any pesticide is the effect of a killing substance on the target population. Because a target population is a biological entity, and as such, subject to evolutionary and ecological processes, evolutionary ecologists would predict that a substance designed to kill insects would at the same time act as a selection pressure for resistance to the same substance.

理论上，我们需要关注的问题之一是，杀虫剂对目标群体杀伤作用的影响，因为，目标群体属于一个生物体系，同样需要遵从进化和生态学过程，进化生态学家认为，杀虫剂用来杀虫同时，也是一种针对杀虫剂抗性的选择压力。

Events,Operation and Relation of Sets, Classical Probability, Geometrical Probability , Statistical Stability of a Frequency, Axioms of Probability, Conditional Probability, Total Probability Theorem, Bayes' Rule,Independent Events,Independent Repeated Trials, One Dimensional Random Variables, Discrete Random Variables, Distribution Function of a Random Variables , Continuous Random Variables, Normal Distribution, Distribution of a Function of a Random Variable, Multidimensional Random Variables, Joint Distribution Function, Marginal Distribution Function,Discrete Two—Dimensional Random Variables,Continuous Two—Dimensional Random Variables, Independent Random Variables, Distribution of Functions of Random Variables,Expectation,Variance, Covariance, Coefficient of Correlation, Bivariate Normal Distribution, Law of Large Numbers, The Central Limit Theorems, Sample and Population ,Chi—Squared, T and F Distributions , Sampling Distributions , Point Estimation , Interval Estimation , Testing Hypotheses , A Test of Significance for Parameters in a Single Sample From a Normally Distributed Population , A Test of Significance for Parameters in Two Sample From Normally Distributed Populations .

本课程的主要内容：概率的概念与运算、随机变量及其分布、随机变量的数字特征与极限定理、数理统计的基本概念、估计和检验的基本方法，随机事件与概率随机事件、事件的关系与运算、几何概率、统计概率等，条件概率、全概率公式、贝叶斯公式、事件的独立性、二项概率公式，随机变量的概念、离散型随机变量、随机变量的分布函数、连续型随机变量、随机变量函数的分布，多维随机变量及其分布函数、边缘分布函数、随机变量的独立性、二维随机变量函数的分布，数学期望、方差、协方差和相关系数、大数定律、中心极限定理，总体与样本， X 2-分布、 t-分布和 F-分布，统计量及抽样分布，假设检验的基本概念、单个正态总体参数的显著性检验、两个正态总体参数的显著性检验。

The same figure shows also their bivariate population distributions as a function of population density and vegetation fraction.

同样图并且显示他们的二元人口分布作为作用人口密度和植被分数。

Historical population evolution model and Brownian movement of population in modem history; put forward urbanization model of North China Plain ie.

全球变化不仅涉及到地球系统的各个层次，而且还与地球星际环境的各种变化（如近地行星运动、慧星运动、太阳系的运动、银河系的运动等）存在着相关。

The results show that cattle grazing in rubber plantations increased the population number of land leech by 3.43-folds within one year, while chemical weedings in rubber ledge contour and total area in rubber plantations reduced the population number by 29.82% and 50\^21%, respectively.

结果表明，橡胶园内牛群放牧使海南山蛭种群数量 1年内增加 3 43倍。化学除环山行杂草、化学全面积除杂草使山蛭种群数量在 1年内分别减少 2 9 82 %和 5 0 2 1%。除草剂混入杀蛭农药，使山蛭种群数量 1年内减少 73 0 2 %。

According to the latest population census, the population of China has exceeded 1 billion.

据最新的人口普查，中国人口已超过10亿。

Due to government financial insufficient, local industry characterless, and lacks of competitiveness, DongHwa University District, suffering from developing stagnant, is unable to attract investors as well as population to enter and garrison, causing problems like policy procrastination, immigration, aging population and recession.

深受开发停滞的东华大学城特定区由於政府财力不足，且地方产业缺乏特色与竞争力，无法吸引投资厂商与人口之进驻，造成政策延宕、人口外移、老化与经济衰退等问题。

Population of 14.8 million. there are more than 100 nationalities, including Russians accounted for 83% of the total population , Tatar, Ukrainian, Chuvash,, Daghestan, Bashkir, Moldova and Belarus are also large ethnic populations.

人口1480万。有100多个民族，其中俄罗斯族占总人口的83％，鞑靼、乌克兰、楚瓦什，、达格斯坦、巴什基尔、摩尔多瓦和白俄罗斯等民族人口也较多。

Aldrin at concentrations higher than 40 μg/L decreased life expectancy at birth of F1 generation of the cladoceran, that at 20 μg/L and 80-640 μg/L decreased net reproduction rate, that at 320 and 640 μg/L shortened generation time, and that at all the concentrations decreased intrinsic rate of population increase. Aldrin at 160-640 μg/L shortened life expectancy at birth and generation time of F2 generation of the cladoceran, that at 160 and 640 μg/L decreased net reproduction rate, but that at all the concentrations except for 40 and 320 μg/L increased intrinsic rate of population increase.

浓度高于40μg/L的艾氏剂使多刺裸腹溞F1代的生命期望显著缩短，20μg/L和80~640μg/L的艾试剂使F1代的净生殖率显著降低，320μg/L和640μg/L的艾氏剂使F1代的世代时间显著缩短，所有浓度的艾试剂均使F1代的种群内禀增长率显著降低。160~640μg/L的艾氏剂使多刺裸腹溞F2代的生命期望和世代时间显著缩短，160μg/L和640μg/L的艾氏剂使F2代的净生殖率显著降低；除40和320μg/L外，所有浓度的艾试剂均显著提高了F2代的种群内禀增长率。

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。