prevalence

However, no study on the prevalence of infertility has been conducted in this area.

但是，在这个地区不曾进行过任何关于不孕症流行情况的研究。

The prevalence of these widgets means they can report on almost all your browsing activity, which can then be linked to databases full of the social data you intentionally share.

这些小工具的流行意味着它们能上报几乎所有的你的浏览行为，通过这些行为就能链接到你主动共享出来，满是你社交信息的数据库。