n.流行；普遍；广泛
prevalency───流行
prevalent───adj.流行的；普遍的，广传的
trivalence───n.三价
polyvalence───n.多价；多方面相关性
prepollence───优生
prevalently───adv.流行地，普遍地
prevenience───n.照料；预期
bivalence───n.二价（等于bivalency）
covalence───n.共价；共价键
The prevalence of black and Asian faces among those targeted has caused especial resentment.───黑人和亚洲人的面孔在那些目标人群中普遍存在，这引起了特别的不满。
Epidemiological studies have found that children with PDD have no higher prevalence of gastrointestinal tract than normal children.───流行病学研究发现，广泛性发育障碍（Pervasive Developmental Disorder）孩子和正常孩子相比较并没有更高的胃肠道患病率。
prevalence of tea in their culture?───茶在他们的文化中流行而造成的吗？
The prevalence of a global culture is no doubt harmful to any local culture and mores.───全球文化的盛行毫无疑问是对任何当地文化和风俗有害的。
Virtually all said the growing prevalence of mothers who have no male partners around to help them raise children is bad for society.───基本上他们都认为目前越来越多的身边没有丈夫帮忙而独自抚养孩子的单身妈妈对社会很不利。
With increasing prevalence of mobile devices, the IrDA communications have come into a golden age of development.───随着移动设备的日益普及，红外数据通讯已经进入了黄金发展时期。
The prevalence of silicosis led some men to grow what is called a miner's mustache, in an attempt to intercept as much dust as possible.───在试图拦截尽可能多的灰尘，矽肺患病导致一些男性到什么是所谓的一个矿工的胡子增长。
Limpho and an army of trained peer leaders and coaches visit schools in Lesotho's high-prevalence districts at least twice a week.───李梦符和其他很多受过培训的同龄领导和老师每周至少两次到莱索托高发病率地区的学校进行访问。
The prevalence of incontinence increases with age, and in women it is often associated with childbearing and the menopause.───尿失禁的流行率随着年龄而增长，并在妇女往往是与生育和绝经期。
Yet paradoxically, so did the prevalence of HIV infection.
Psychiatric symptoms Further data concerning the prevalence of a variety of psychiatric symptoms are available from the health and lifestyle survey.
Prevalence of obesity Obesity appears to be related to cultural practice as it varies according to class.
Main outcome measures - Prevalence at birth and prevalence after prevention in 73 congenital abnormality types or groups.
They were very surprised by the prevalence of anti - government sentiments.
In inner cities the prevalence of depression among mothers of young children is even greater.
Consequently, it was forecast that the prevalence of heroin use might also begin to fall from 1988-9.
In fact, East Anglia's sickness prevalence rate is 15.6 higher than the predicted 189.4, namely 205.
We have earlier discussed the prevalence of ageism.