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. 美國並非不會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巨大的優勢。
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