It is perhaps surprising to argue that an employed population could be enticed to move, but an explanation lies in the labor conditions then prevalent in the South.

一个有工作的人口可能会被吸引到别处去，这种说法也许令人吃惊，但一个解释在于当时在南方盛行的劳动条件。

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These conditions are most prevalent in tropical regions; however population migration has spread these diseases to most countries.

这些病症在热带地区最为普遍；不过，随着人口迁移，这些疾病已传播到大多数国家。

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Poor brain development causes learning disabilities in 2% to 3% of the population, but the problem is more prevalent in males.

有2%到3%的人因大脑发育不良而引发学习障碍，但这类学习障碍者绝大多数是男性。

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Most people think of eating disorders as either anorexia or bulimia (self-induced purging), but there is a less recognized clinical syndrome, disordered eating not otherwise specified, which may affect a significant portion of the population and seems to be especially prevalent in female college athletes.

CNN: Why do I always think about food?