Avian influenza has caused widespread epidemics in bird population in many parts of the world.
禽流感已逐渐演变成在全球各地禽鸟中散播的疫症。
In early summer the bird population increases and we look forward to the return of many of our beautiful bird friends.
初夏，鸟的数量增长，我们盼望着许多美丽的鸟类朋友的回归。
If you provide all these things, without annoying the birds, you should have a fine bird population to entertain you this summer.
如果你能提供所有的这些东西，而且不骚扰鸟儿们，那么这个夏天，你就能有好多鸟儿陪伴你了。
Three of the cases they studied found that the rise of West Nile virus in the U.S. corresponded to decreases in bird population density.
他们在研究过的三个案例中发现西尼罗河热在美国的的流行与鸟类种群密度的下降相关。
Despite efforts to vaccinate and control the population of infected birds, H5N1 is considered firmly entrenched in bird populations across large parts of Asia.
尽管人们努力接种疫苗和控制已感染的禽鸟数量，但H5N1病毒仍顽强地存于亚洲大部分地区禽鸟群内。
So pesticides have significantly contributed to declines in bird population and because there will continue to be a need to control agricultural pests in the future this decline will continue.
所以，杀虫剂会对鸟类的数量有非常严重的影响。同时，因为即便是在将来，还是需要杀虫剂来控制农业害虫，所以，鸟类数量减少的趋势难以改变。
So, pesticides have significantly contributed to declines in bird population, and because there will continue to be a need to control agricultural pests in the future, this decline will continue.
所以，杀虫剂会对鸟类的数量有非常严重的影响。同时，因为即便是在将来，还是需要杀虫剂来控制农业害虫，所以，鸟类数量减少的趋势难以改变。
Bird songs and calls as one of the most important features, which contain abundant biological information, are vital for the research of Avi-behavior, bird population structure and classification.
鸟类的鸣声中包含有丰富的生物学信息，研究鸣声对于了解鸣声与行为的关系、鸟类的种群结构及种属分类具有重要的实际意义。
The latest version of the department's annual State of the Birds report shows that nearly a third of the nation's 800 bird species are endangered, threatened or suffering from population decline.
该部门年度鸟类报告的最新数据显示，美国大约800个鸟类物种的三分之一由于种群数量减少而濒临灭绝。
With sightings of the bird down nearly 80 percent compared with 2001, BirdLife now estimates the species's population at somewhere between 60 and 130 individuals.
眼看着泰塔娇莺的数量与2001年相比减了80%，如今鸟盟估计栖息某处的泰塔娇莺的种群数在60至130只。
DDT was banned in the 1970s, in part because it had been found to be weakening bird eggs, resulting in serious population declines.
滴滴涕在20世纪70年代被禁止使用，部分原因是它已被认定是鸟蛋变脆的罪魁祸首，造成了鸟类数量的严重下降。
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。
The monitoring index system include such content as meteorology, vegetation, soil, bird, animal, soil and water loss, population, land using, livestock raising, economy and so on.
监测指标体系包括气象、植被、土壤、地形地貌、鸟类、兽类、水土流失、人口、土地利用、畜牧、经济等内容。
The influences on bird species caused by grazing disturbance are not parallel, because different population has different quantity.
放牧干扰对群落中各种鸟的影响不平行，体现在不同种群数量的变化。
More than half of the monitored bird species that live on prairies have experienced population losses.
草原上生活的被检测的鸟类，有一半以上已经经历了数目损失。
With the world's biggest poultry population and hundreds of millions of farmers raising birds in their backyards, China is seen as crucial in the global fight against bird flu.
中国拥有全球最多的家禽，亿万农户都在自家庭院中进行饲养。因此，在全球抗击禽流感的斗争中，中国至为关键。
With the world's biggest poultry population and hundreds of millions of farmers raising birds in their backyards, China is seen as crucial in the global fight against bird flu.
中国拥有全球最多的家禽，亿万农户都在自家庭院中进行饲养。因此，在全球抗击禽流感的斗争中，中国至为关键。
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