During an infection the number of mites increases rapidly, then drops off leaving infected persons with a relatively stable population.

螨感染人数在急剧增加，感染人数则下降客留下了一个比较稳定的人口。

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With aging of the population in worldwide, the prevalence of osteoporosis increases rapidly and it will be a huge financial burden to all the countries.

随着人口的老龄化，骨质疏松症患病率迅速增加，给世界各国带来沉重的经济负担。

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Along with the swift development of Chinese economy, Chinese city scale is extended rapidly, city population increases fast.

随着中国经济的迅猛发展，中国的城市规模急剧扩张，城市人口飞速增长。

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First, the human population has expanded rapidly during that period, which increases the size of the gene pool in which mutations can occur.

ECONOMIST: Human evolution