The percentage of retirement-age people in the labor force has doubled over the past three decades.
过去三十年来，退休年龄人口在劳动力中的比例翻了一番。
They also replenish-and help fund benefits for-an aging American labor force that will retire in huge Numbers over the next few decades.
他们也为老龄化的美国劳动力结构进行劳动力补充和积累，这种结构将会在未来十年使得大量的劳动力得以退休。
The economy of distressed backward areas has been operated in substituting labor force on the long edge for capital (and technology) on the short edge and over exploiting land resources to the utmost.
贫困落后地区的经济运行是以劳动力长边最大限度地替代资本（技术）短边，超强度地开发土地资源维系的。
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