The human population swelled, at least temporarily, as migrants moved south.

随着移民们南移，人口便增加了，至少是暂时增加了。

《柯林斯英汉双解大词典》

The bureau's statistics imply that net immigration into Australia last year swelled the population by 303, 630 - that's Geelong and Ballarat combined.

统计局数据显示去年进入澳洲的移民的净流量为303，630人，这个数字是Geelong和Ballarat地区人口的综合。

youdao

Since a new Spanish railroad opened in 1992, Madrid's business population has swelled at the expense of Seville.

而自从新的西班牙铁路在1992年开通以后，马德里的商业人口膨胀，却牺牲了塞维利亚作为代价。

youdao

And Little Havana's population swelled again during six months in 1980, when more than 100,000 Cubans were permitted to leave Castro's island en masse in what came to be called the Mariel Boatlift.

VOA: standard.2010.04.19

The population swelled to 25, 000, but over the last five years poaching has skyrocketed again.

NPR: UN Calls For Clampdown On Illegal Wildlife Trade

She said there were 10, 500 people living in Minehead, and 6, 500 visitors to Butlins at a weekend meant the town's population swelled by two-thirds.

BBC: Minehead Butlins

By the end of the first quarter 2011, the Weibo population swelled to 140 million users, Sina said in an earnings statement in May.

FORBES: Tech Savvy and Innovative