These are California's two greatest centers of population and financial power.

这是加州最大的两个人口中心和金融中心。

It helps if there's enough distance between the earth quakes epicenter and a center of population.

如果地震震中和人口中心之间有足够的距离，就会有帮助。

The center of population of the United States had passed to the Ohio Valley.

美国的人口中心已经转移到俄亥俄河谷。

Mr Buhari, who came to power under a pledge to defeat the group this year, said the militants could no longer mount conventional attacks against government forces or centers of population.

上任时承诺今年击败该组织的布哈里称，这些武装分子已无力向政府军或人口中心地区发动常规袭击。