populations是什么意思？

populations

英[pɒpjʊ'leɪʃnz] 美[pɒpjʊ'leɪʃnz]

• n. 人口( population的名词复数 )，全体居民，特定人[动物]群；

例句

• Nonexposure of susceptible plant populations to their pathogens is fairly common. 感病的植物群体不暴露在它们的病原之下,这是相当普遍的.
• Periodic local catastrophes reduce populations. 周期性的局部地区的灾变降低了种群的数量.
• The results show that rarer variants are distributed more unevenly among populations. 本研究结果显示:越罕见的变体,其在人群中的分布也越不均衡.
• Mutual competition and mutual dependence relations coexisted among all the microbe populations. 这些微生物之间存在着相互竞争、相互依存关系.
• During the transience the electron and photon populations deviate slightly from their equilibrium values respectively. 在瞬态过程中,电子和光子的密度各稍微偏离其平衡值.
• Fish populations assume highly localized distributions within each river. 鱼群分布集中在每条河的某些区域.
• Gene flow The movement of alleles within and between populations of the same species through interbreeding. 基因流动:同一种群内由于杂交或种内选择使某一等位基因在该种群内扩散.
• Leaving some fields fallow provided a natural check on insect populations. 让一些土地休耕是自然控制昆虫数量的办法.
• Populations tend to grow at an exponential rate. 人口趋向于以指数比率增长.
• DEG in toothpaste has a low but meaningful risk of toxicity and injury to these populations. DEG在牙膏中含量低但长期毒性和损伤给这些人带来了危险.

英语四级真题

a political scientist at the University of Colorado, Boulder, who studies disaster trends, said the Forum's report was "a methodological embarrassment" because there was no way to distinguish deaths or economic losses related to human-driven global warming amid the much larger losses resulting from the growth in populations and economic development in vulnerable (易受伤害的) regions.
出自-2011年6月阅读原文

英语六级真题

Societies that cannot replace their populations discourage investment and innovation.
出自-2013年12月阅读原文
Fully developed, mature, post-industrial societies, such as those in Europe, characterised by stable or declining populations which are increasing in age
出自-2013年12月阅读原文
Until the early 1990s nobody much thought about whole populations getting older.
出自-2010年12月阅读原文

柯林斯高阶英汉双解学习词典释义

• N-COUNT
  （某一国家或地区的）全体人民，人口
  The population of a country or area is all the people who live in it.
  例句
  Bangladesh now has a population of about 110 million. 孟加拉国现有大约1.1亿人口。 ...the annual rate of population growth. 人口年增长率
• N-COUNT
  （某一国家或地区某类人或动物的）总数
  If you refer to a particular type of population in a country or area, you are referring to all the people or animals of that type there.
  例句
  ...75.6 per cent of the male population over sixteen. 16岁以上男性中的75.6% ...areas with a large black population. 黑人人口众多的地区