the quality of prevailing generally; being widespread;
"he was surprised by the prevalence of optimism about the future"
(epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population
a superiority in numbers or amount;
"a preponderance of evidence against the defendant"
prevalence的用法和样例：
例句
用作名词 (n.)
Thus, lists of STDs may change over time and include more or fewer diseases depending on their prevalence. 所以，性传播疾病的病名录可以随时发生改变，以及依据其流行程度会作出调整。
The translation of Buddhist sutras promotes the prevalence and development of Buddhism in China and brings great influence to Chinese culture. 佛经译介促进了佛教在中国的传播与发展，对中国思想文化产生了巨大影响。
This information will be used for tracking virus prevalence. 此信息会用来跟踪病毒流行情况。
Prevalence and incidence are covered in the following section. 以下部分包括流行状况和影响范围。
Fewer people go out at night with the prevalence of TV. 随着电视机的普及，夜晚出门的人少了。
With increasing prevalence of mobile devices, the IrDA communications have come into a golden age of development. 摘要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。
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