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。
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。
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。
Even the slower-growing sheep have a chance of making it, and this means smaller individuals are becoming increasingly prevalent in the population.
甚至缓慢生长的羊也有成功的机会，这意味着较小的个体在这个群体之中变得日益普遍。
"Nearly a quarter of all women suffer from at least one pelvic-floor disorder, and, with the aging of the population, this will become more prevalent," he said.
“接近四分之一的妇女至少有一次盆底紊乱，而且，随着年龄的增加，发生率更高。”他说。
Bipolar disorder occurs in only about 1% of the population, and it's equally prevalent in women and men.
大约有1%的人在生命的某个时间段会患上双极抑郁症，男女的比例相同。
Bipolar disorder occurs in only about 1% of the population, and it's equally prevalent in women and men.
大约有1%的人在生命的某个时间段会患上双极抑郁症，男女的比例相同。
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