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。

youdao

Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods.

因为每个个体的生命都是短暂的，“机会主义者”这类物种的群体数量很可能受到干旱、严冬或者洪水等不利因素的影响。

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It is called the initiative for Reducing Emissions from Deforestation and Degradation, where local population would be paid to protect forests.

VOA: standard.2010.02.24

Some people in the population are more biologically vulnerable than others, and the Pimas appear to be one of those groups.

人群中有一些群体,在生物学上处于弱势,皮玛族就是其中之一

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

That's important, too, because you need to be able to tell if the virus is present in the human population.

这一点也非常重要,因为你要能够分辨出,人群中是否有人感染了天花病毒

耶鲁公开课 - 生物医学工程探索课程节选

Several decades ago, many people considered rising population to be the main challenge facing humanity.

FORBES: Thomas Malthus: Wrong Yesterday, Right Today?

However, activists say it is commendable for an otherwise indifferent youth population to be as involved as this.

BBC: The websites of India's 'e-election'

But others will criticise the institution for allowing climate change and population to be set against each other in the public debate.

BBC: Harrabin's Notes: Population overload?