查询词典 decrease in population

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。

With its basis on city attraction-φ and adoption of surface tension in physics, a math model about the floating population in city is established in this paper. This model takes the coacervation and escape of the molecule as the inflow and outflow of the population, the electric field intensity as the policy, and the electric conductivity in electrolytic solution as the enforcement of the policy.

以φ-城市吸引力为依据，借用物理学中"表面张力"的概念，把分子的凝聚和逃逸理解为人口的流进与流出，把电场强度理解为城市的政策、法规、法令，把电解溶液的电导率理解为对政策、法规、法令的执行情况，建立了城市流动人口的数学模型。

It permits a population to spread as the population increases, and it enables the colonization of new sites.

它使得种群在其增长的时候得以扩展它的分布区域并移居到新的场所。

This study is of great importance in realizing the basic laws about the population forming and developing of the two planthoppers. It also gives the theorical basis for analyzing and forecasting the population dynamics of the two planthoppers under the commensalism condition.

本研究对深入认识水稻混作区的两种飞虱种群发生与发展的基本规律具有重要意义，亦为分析与预测两种飞虱在共栖条件下的种群动态提供了依据，还为全面理解稻飞虱的致害性做了一定深度的探讨。

Boundednesses of population and toxin in population and in the environment are shown by comparison theorem.

通过比较定理得到了种群的有界性，及种群体内毒素和环境中毒素的有界性。

In the first chapter, we research the dynamics of population which were in the polluted environment, we will: give the corresponding mathematical model;(2): obtain the explicit conditions for the threshold of the population by means of comparison theorem.

第一章是研究污染环境中种群的动力学行为，首先给出相应受污染系统的数学模型，然后研究系统中种群的持久生存和灭绝问题，在具体模型中，运用比较定理研究种群生存的阈值。

With the modernization of scientific and technological progress and industrial development, physics, chemistry, biology, engineering, aerospace, medical, economic and financial areas of the many principles and laws can be described as an appropriate ordinary differential equations, such as Newton's laws of motion, gravity law, law of conservation of mechanical energy, energy conservation law, the law of population development, ecological population competition, disease transmission, genetic variation, the trend of the stock's up V, the floating interest rates, the market equilibrium price changes.

随着科技进步和工业现代化的发展，物理、化学、生物、工程、航空航天、医学、经济和金融领域中的许多原理和规律都可以描述成适当的常微分方程，如牛顿的运动定律、万有引力定律、机械能守恒定律，能量守恒定律、人口发展规律、生态种群竞争、疾病传染、遗传基因变异、股票的涨伏趋势、利率的浮动、市场均衡价格的变化等。

China's productive forces, science and technology, and education is relatively backward, industrialization and modernization still has a long way to go; The urban and rural economic structure has not changed, regional disparities have not reversed the trend, also quite poor; Total population continued to increase, rising proportion of the elderly population, employment and social security pressure; Ecological environment, natural resources and economic and social development have become increasingly conspicuous; we still face in the developed countries in the economic and scientific superiority pressure; economy and other aspects of the management system is not perfect; the building of democratic legal system and ideology and morality, there are still some problems which can not be overlooked.

我国生产力和科技、教育还比较落后，实现工业化和现代化还有很长的路要走；城乡二元经济结构还没有改变，地区差距扩大的趋势尚未扭转，贫困人口还为数不少；人口总量继续增加，老龄人口比重上升，就业和社会保障压力增大；生态环境、自然资源和经济社会发展的矛盾日益突出；我们仍然面临发达国家在经济科技等方面占优势的压力；经济体制和其他方面的管理体制还不完善；民主法制建设和思想道德建设等方面还存在一些不容忽视的问题。

Especially after chairman Hujintao's talk at the central conversazione about population resource and environment that we should have a sustainable development idea with mankind as our root, sustainable development has become an important topic in our country and the problem of population ageing should not be neglected for its significant influence on our sustainable development.

特别是胡锦涛同志在中央人口资源环境工作座谈会上的讲话中强调指出我国要坚持以人为本，全面、协调、可持续的发展观后，可持续发展已成为我国发展进程中的主旋律。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。