These fish and snails have themselves experienced a decline in population because of overfishing by humans.
由于人类的过度捕捞，这些鱼和蜗牛的数量已经有所下降了。
Secondly, the marriage age in the West is rising, which contributes to the decline in population there.
其次，西方国家结婚年龄在上升，这也促使了人口的下降。
The dynamics vary significantly by region, with some regions, notably Europe, facing the prospects of a rapid decline in population and labor force.
各地区的发展趋势差异很大。有些地区，主要是欧洲地区，面临人口和劳动力急剧减少的前景。
The tragedy is that many of these programmes are now threatened by the current catastrophic decline in population of the chimpanzee across Africa.
悲剧是现在整个非洲的猩猩数量急剧减少，许多这样的项目受到影响。
The ISTP team's research demonstrates that the population and job density of cities rose or remained constant in the 1980s after decades of decline.
ISTP团队的研究表明，在经历了几十年的衰退后，城市人口和工作密度在20世纪80年代上升或保持不变。
With a decline in starfish predators, the starfish population can increase.
随着海星捕食者的减少，海星的数量会增加。
The question of whether the decrease in plant fecundity caused by the spraying of pesticides actually causes a decline in the overall population of flowering plant species still remains unanswered.
喷洒杀虫剂导致的植物繁殖力下降是否真的会导致开花植物物种总数的下降，这个问题仍然没有答案。
In the following sections, we verify our hypothesis and evaluate the role of climate change on war outbreak and population decline with empirical data at global and continental scales.
在以下的章节中，我们将以实证数据在大陆和全球的范围内验证验证我们的假说，评价气候变化对于战争爆发和人口下降的影响作用。
What matters most for Japan’s economic growth prospects is the decline in its working-age population, those aged 15-64, which has been shrinking since 1996.
对日本经济增长前景最重要的影响因素是其工作年龄人口数量的下降。 工作年龄人口是指15~64岁间的人，自1996年以来一直在下降。
In some case, non-native species of oysters are introduced after a population decline, and they bring with them diseases that further kill off the native oysters.
在一些例子中，非本土种类的牡蛎会在本土数量下降后引入，它们随身带来的疾病会进一步杀死光本土牡蛎。
In a given area, the worst will usually be over in four to six weeks as the virus rushes through a susceptible population, cases peak and infections decline with equal speed.
在既定区域，最坏的情况是，当病毒急匆匆地冲向易感人群后的四到六周内，病例数到达顶峰，接着匀速下降。
Overall "we estimated the decline in this pig-nosed turtle population to be more than 50% since 1981," said Professor Eisemberg.
总体而言“我们估计从1981年以来猪鼻龟数量的下降超过了50%，”艾森·博格教授说道。
Businesses needed to bring more old people and women into jobs, to counter the decline in the working-age population.
企业需要让更多的老人、妇女投入工作，以针对性地解决工作年龄的人口减少的问题。
In 2008, the estimated per capita TB incidence was stable or falling in all six WHO regions. However, the slow decline in incidence rates per capita is offset by population growth.
2008年，结核人均估计发病率在世卫组织所有6个区域中趋于稳定或下降，但是人均发病率缓慢下降被人口增长所抵消。
It was the first country in the world to experience long-term population decline, starting in the late 18th century.
它是世界上第一个经历长期人口衰落的国家——从十八世纪就开始了。
In 1998, the labor force started to shrink, and a decade later, the country's population began to decline.
到了1998年，劳动力人数开始缩水，并且十年之后，国家人口数开始下降。
Beginning in 2004 the percentage of the world's population that became ill with TB in a given year flattened and then began a slow decline.
从2004年开始，在给定的年份中全世界因结核病而病倒的人口百分比不再增长，随后开始缓慢下降。
The lack of data on bee health has been a hurdle in identifying the causes of the population decline, the Commission has said.
委员会表示由于缺少蜜蜂健康数据将会影响对于蜜蜂数量下降原因的确定。
After decades of emigration and decline, Poland's Jewish population is growing again, as children sheltered in secret by gentile families during the war rediscover their roots.
移民数量在经历了几十年的下降之后，波兰犹太人的数量开始增加，因为很多得到好心人帮助幸免于难的犹太儿童开始寻根之旅。
As birth rates decline, the proportion of children shrinks and the working-age population bulges, as is happening now in Africa. That can kick-start industrialisation.
在生育率下降的同时，儿童数量的减少和适龄工人数量的增加，可刺激非洲的工业化进程。
Given present trends, total population will likely decline from around 130 million to under 90 million in 50 years or so.
按照目前的发展趋势来看，在未来50年左右，我们的总人口数量将很有可能从1.3亿下降到9000万以下。
They were declared a vulnerable species in 2006 when the population was estimated to be between 125, 000 to 150, 000, a decline of 7% in 10 years.
他们宣称这个脆弱物种的数量在2006年时估计在125000——150000只之间，十年内下降了百分之七。
You cannot track the decline and survival of the tiger population in surveys conducted every four years.
在每四年进行一次的调查中，你不能够跟踪老虎数量的下降和存活。
The researchers also found that more than half (54 percent) of the decline in the predatory fish population has taken place over the last 40 years.
研究者还发现在过去的四十年中食肉鱼类的数量减少了一半以上（54%）。
In addition to higher prices for food the WFP has to cope with climatic change, a rapidly increasing world population and the decline in the rich world's aid budgets.
除粮食的高价之外，世界粮食计划署不得不去处理气候变暖，世界人口增长过快和发达国家援助减少等问题。
European Americans had, as expected, continued their slow decline in percentage of the total U. S. population, though they were still dominant at about 76%.
欧裔美国人一如所料在美国人口总数所占的百分比继续迟缓下降，虽然他们还占大约76%的绝大多数。
There has been a gradual decline in the population of the town.
该镇的人口一直在逐渐减少中。
European Americans had, as expected, continued their slow decline in percentage of the total U. S. population.
欧裔美国人一如所料在美国人口总数所占的百分比继续迟缓下降。
"These results, therefore, suggest that obesity in old age does not have a substantial relation to cognitive decline in a cognitively healthy community population," the investigators concluded.
这些结果，揭示了在一个健康社区人都种，老年肥胖症与认知功能降低没有实质性的联系。调查者总结道。
"These results, therefore, suggest that obesity in old age does not have a substantial relation to cognitive decline in a cognitively healthy community population," the investigators concluded.
这些结果，揭示了在一个健康社区人都种，老年肥胖症与认知功能降低没有实质性的联系。调查者总结道。
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