长久以来，美国人口频繁流动，为美国经济实力壮大做出了巨大贡献。因为人口流动能够扩大高效劳动力市场，降低失业率。
A high degree of population mobility has traditionally been one of America's great economic strengths, providing a flexibility that allows for more efficient Labour markets and lower unemployment.
火柴兵不即是为人类效劳的吗？
只要当人民成为国度的主人，迷信才干为人民效劳。
It is only when people become the masters of the country that science can serve the people.
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