China's population is aging at unprecedented levels. 使中國人口老齡化達到了前所未有的水平。
Though the US is not immune to population aging, its higher level of fertility combined with immigration gives it an enormous advantage. 美國并非不會(huì )受到人口老齡化的影響，但高水平的生育率加大量的移民給其帶來(lái)巨大的優(yōu)勢。
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