This population shift is bringing problems as well as benefits.

人口的转移带来了利益的同时也带来了问题。

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That shift affected only one segment of the population.

这种转变只影响了一部分人口。

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As the population aged, there was also a shift from the cold Rust Belt to the comforts of the Sun Belt.

随着人口的老龄化，人们也从寒冷的铁锈地带（指美国传统工业衰退的地区）转向舒适的阳光地带（指美国南部）。

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China has already experienced a tremendous population shift from its farms and rural areas to the cities in search of higher paying jobs.

FORBES: China's Next Act

This significant shift in population mix can fuel further growth in annuity sales for companies like MetLife.

FORBES: Annuities Put MetLife Growth On Steroids, Stock May Be Too Pumped Up

Selection can shift a population from life in the trees to life on the ground by tiny steps but only if the right kind of variation is available.

ECONOMIST: A master of evolution takes a last long look at Darwin