But when you have a large population, well, the whole population can't just get up and move to follow a wild herd of animals.
但是当你所属的种群人数众多时，就不能整个种群一起追踪一群野生动物。
Those invasive species have a large population, and they rend apart the native food web. They disturb an already stressed community.
这些入侵物种是一个大的群体，他们撕裂了本地食物网并扰乱本已稳固的生物群落。
If the virus had been capable of spreading through the air, or if one infected person had unknowingly entered a large population center, Ebola might have become a worldwide epidemic.
如果这种病毒能够通过空气传播，或者如果一名感染者在不知情的情况下进入了人口密集的地区，那么埃博拉可能已经成为一种全球流行病。
Bears reproduce slowly, he says, so killing even a few could have large repercussions on the state's population of black, brown and grizzly bears.
他说，熊繁殖很缓慢，所以即使只杀掉很少的熊都会对该州黑熊、棕熊和灰熊的数量产生很大的影响。
A large bat population was seen in the cave and the woman is reported to have had direct contact with one bat.
在该洞穴里见到过大量蝙蝠，而患者本人与一只蝙蝠有过直接接触。
A large fraction of the top 1 percent's gains have actually gone to an even smaller group, the top 0.1 percent - the richest one-thousandth of the population.
最顶层1%人士收益中的一大部分实际上到了人数更少的人即最顶层的0.1%的手里，他们是最富有的千分之一。
Studying a large population tends to give a more accurate result than studies of smaller places such as Scotland, parts of Italy and New York state, where more impressive reductions have been claimed.
对庞大的人口进行研究，得出的结果比研究较小范围得出的结果更精确，例如苏格兰、意大利的部分地区和纽约州，这些地方心脏病住院患者的减少幅度更令人欣喜。
The cases of natural selection that have been tracked so far take the form of substantial sweeps, with a new version of a gene being present in a large percentage of the population.
我们目前跟踪过的自然选择案例大多都较为全面经历过基因扫描，新版基因在某种人当中出现比例非常大。
Zhao: in our lab, we have a large intern population and a lot of connections with top universities in the region.
赵峰：我们实验室有大批实习生，同本地区的一流大学也经常来往。
Thus, because we have such a large and diverse sample size, including women from 40 sites across the nation, our results can be generalized to a healthy population.
因为我们应用了大量不同样本，包括国家的40个地区的妇女，我们的结果可以推广到健康人群。
Tree populations in the wild usually satisfy those criteria, but research centers would simply not have enough capacity to keep a large and diverse population of Torreya trees.
在野外生长的树木一般可以满足这些要求，但是研究中心没有能力保护数量足够多，基因足够多样化的香榧树。
The advantages and disadvantages of a large population have long been a subject of discussion among economists.
庞大人口的优势和劣势一直以来都是经济学家们讨论的话题。
Shandong province is a major agricultural province, large agricultural population, the majority of junior middle schools in rural areas, rural school sports have become the weak link in rural schools.
山东省是个农业大省，农业人口较多，大多数的初级中学在农村，农村学校体育已成为农村学校教育的薄弱环节。
Prevention of this disease would have a major impact on disease-associated cost, morbidity, and mortality for a large segment of the population.
通过对膀胱癌的预防必将对疾病相关的费用、发病率及死亡率等方面起到积极的作用。
The city population size does not have much relationship with per capita GDP, even has a negative impact on the group of large cities.
人口规模与城市人均gdp之间关系不大，在大城市组甚至呈负相关。
Despite China's vast territory, the amount of arable land is limited, and neither this fact nor the fact that we have a large, mostly peasant population can be easily changed.
土地面积广大，但是耕地很少。 耕地少，人口多特别是农民多，这种情况不是很容易改变的。
We have basic research, we have oncology, we have hepatology, we also have a large proportion of interventional cardiologists, and as a whole the universal population is well represented.
有基础研究，肿瘤学，肝病学，也有很大比例的介入心脏病学专家，各个领域均受到重视。
China has a large population and little farmland, a relative shortage of resources, and with continued population growth, land will have increasingly heavy pressure.
我国人口多、耕地少，资源相对不足，且随着人口的不断增长，土地的压力将日益沉重。
In the United States in the 1960s, a large percentage of donated blood was obtained from paid donors, who were more likely than the general population to have hepatitis b.
在美国，20世纪60年代，捐献的血液大部分取自付费的捐献者，这些人比普通人更容易患有乙肝。
For a country with a large population, insufficiency in employment effect is not only a waste of human resources, but also can contribute to employment and have an impact on social stability.
对一个人口大国来说，就业效应不足既是对人力资源的浪费，也会导致大量的社会失业人口的存在，影响社会稳定。
The advantages and disadvantages of a large population have long been a subject of discussion among economists.
人口众多的优势和劣势长期以来一直是经济学家们讨论的话题。
Even a small risk to individuals can have big consequences when applied to a large population.
即便对个体来说危险很小，但倘若在人群中广泛应用，也会造成严重后果。
Even a small risk to individuals can have big consequences when applied to a large population.
即便对个体来说危险很小，但倘若在人群中广泛应用，也会造成严重后果。
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