Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.
对人类种群起源和分布的研究曾是基于考古和化石证据。
Considering human capital as a characteristic of the population, however, all four countries were advantaged by the large percentages of their populations who could read and write.
但是，考虑到人力资本是人口的一个特点，这四个国家都因其具有读写能力的人口占比大而更有优势。
Heirloom seeds come from plants that were traditionally grown in human populations, as opposed to the seeds used for large-scale agricultural production.
传家宝种子来自传统的人类种植的植物，而不是来自用于大规模农业生产的种子。
What we see today is the product of evolutionary events, resulting from the dispersal of a few human populations out of Africa around 60,000 to 70,000 years ago.
我们今天看到的是进化事件的产物，是大约6万到7万年前少数人类从非洲迁徙而来的结果。
It's not only the study of human population, but the populations of non-human species, including viruses.
这不仅是对人类种群的研究，也是对非人类种群（包括病毒）的研究。
The researchers pointed out that low-frequency processes, such as fluctuations in stream flow and groundwater levels, would not usually be apparent to human populations.
研究人员指出，低频过程诸如河流流量和地下水水位的波动，通常不会对人类产生明显影响。
These same cycles of change had momentous impacts on the sparse human populations of the region.
这些相同的变化周期对该区域稀少的人口产生了重大影响。
In 2008, for the first time in human history, more than half the world's populations was living in towns and cities.
2008年，超过一半的世界人口居住在城镇中，这是有史以来的第一次。
As conservation areas become smaller, lions are increasingly coming into contact with human populations, which are expanding to the boundaries of these protected areas.
随着保护区变得越来越小以及人类的活动扩张到了这些保护区的边界，狮子跟人类的接触也就越来越多。
In recent years some Inuit people in Nunavut have reported increases in bear sightings around human settlements, leading to a belief that populations are increasing.
近年来，努纳武特的一些因纽特人报告说，在人类居住区周围看到北极熊的情况有所增加，这使人们认为其数量在增加。
Scientists have responded by noting that hungry bears may be congregating around human settlements, leading to the illusion that populations are higher than they actually are.
科学家们的解释则是，有些北极熊由于饥饿可能会聚集在人类居住区周围。这就导致人们产生一种错觉，误认为北极熊的数量比其实有数量要多。
We know the epidemiology, the global trends, and what the shift from affluent societies to poor and disadvantaged populations means in terms of human and economic wreckage.
我们知道流行病学和全球趋势，知道对人类和经济造成的破坏方面，从富裕社会向贫穷和弱势群体的这种转变意味着什么。
Both focus on the underdog, the most vulnerable populations. And both aim to make these people fit to survive, fit to realize their human potential.
两者都着重于受压迫者，最脆弱的人群，并都旨在使这些人能够生存，能够实现其人的潜力。
"Unless human Numbers are in balance with those of neighboring wildlife populations the decline of wildlife will continue to be a hard reality" they wrote.
“除非人口数量与那些与之为邻的野生动物数量处于平衡状态，否则的话，野生动物的减少将继续成为不争的事实，”他们这样写到。
Some human populations have now all but completely stopped growing wisdom teeth, while others have almost 100% likelihood of developing them.
有些人种已经完全不长智齿了，但另一些人种几乎100%的人都会长智齿。
This is because there are so many variables in human physiology that results are often skewed by small populations of people who live in and around the same geographic location.
这是因为很多生活在同一地理位置的小群体导致结果起了变化。
The number of new countries reporting human cases increased from 4 to 9 after October 2005, following the geographical extension of outbreaks among avian populations.
在2005年10月禽类种群中疫情的地域扩大之后报告人间病例的新国家数从4个增加至9个。
Trenberth said because human populations depend on rivers, we need to carefully manage our water supply.
Trenberth称由于人口取决于河流，我们需要小心利用我们的水资源。
But what if factors other than climate, like the food available nearby or the viruses, bacteria, and parasites native to the area, also had an effect on various human populations' genetic toolkits?
但是如果除开气候这一因素，像就近的食物资源或者作为原住民的病毒，细菌和寄生虫等也能对丰富的人类基因工具箱产生影响呢？
There is no doubt that most of the genetic differences between humans and other apes – and between different human populations – are due to genetic drift.
毫无疑问，人类与猿猴之间以及不同人群之间的大部分基因差异都是因为基因漂变而产生。
Relocation is costly and cannot go on forever in a region with swelling rural human populations.
随着农村人口的增加，这种迁移活动不可能在一个地区长期进行。
The widespread persistence of H5N1 in poultry populations poses two main risks for human health.
H5N1病毒在家禽中的持续广泛存在，给人类健康带来两大风险。
The impact of invasive species is often compounded by pollution and burgeoning human populations on the islands, which have outstripped their capacity to deal with waste.
岛上的环境污染和人口的迅速增长超过了他们处理废物的能力，往往加强外来物种的影响。
By Mr Chen's calculation, that brings the population of what is possibly the world's rarest bird up to 32, surviving in colonies near some of the densest human populations on earth.
根据陈水华计算，这种世界上最珍贵的鸟的数量可能已经有32只，存活着的鸟和地球上密集的人类毗邻。
Both elephant and human populations have been booming, thereby creating challenges on land utilisation and a fight for access to water and food resources.
大象和人口的数目都在激增，这为土地利用和水及食物资源的分配形成了新的挑战。
The pace of change accelerated as human populations rose.
随着人类数量的增长，这种变化的速度也越来越快。
The pace of change accelerated as human populations rose.
随着人类数量的增长，这种变化的速度也越来越快。
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