Demographers predict the market for home medical tests in the United States will top $ 3 billion by 2000 as more baby boomers enter their age-related-illness years.
人口统计学家预言，到2000年，随着美国有更多在生育高峰期出生的人进入与他们的年龄相关疾病的时期，家庭医学测试产品的市场销售量将超过30亿美元。
Demographers try to predict social fluidity.
人口统计学家试图预测社会流动性。
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