If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.

如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。

youdao

To stabilize its population—discounting immigration—women must have an average of two children.

为了稳定人口——减轻移民的影响——妇女必须平均生育两个孩子。

youdao

Before the arrival of Europeans, the islands in the two largest cultural areas, Polynesia and Micronesia, together contained a population estimated at 700,000.

在欧洲人到来之前，波利尼西亚和密克罗尼西亚这两个最大的文化区，住着大约70万人。

youdao

The city's population grew between two thousand and two thousand seven, but not as fast as the country as a whole.

VOA: special.2009.03.20

Those are the two population definitions.

这是两种对总体的定义

耶鲁公开课 - 金融市场课程节选

From the point of view of the school age of youngsters' population, there are really, I think, two implicit purposes.

从青少年的,学龄角度考虑，我想存在两个深层目标。

麻省理工公开课 - 媒体、教育、市场课程节选

Ethnic Albanians, who make up about one-third of Macedonia's two million population, have fought for better recognition of its language and an increased presence in parliament and the police force.

CNN: Rebels say Macedonia battle over

In a city with a population two thirds the size of Belfast, they are achieving enormous success and they have been at it for more than 20 years.

BBC: Recycling attitudes 'must change'

The explosive growth of the Atlanta metro area, which encompasses more than 6, 000 square miles of land in more than 25 counties, effectively masked two decades of population losses within the city's traditional limits.

FORBES: America's Comeback Capitals