So, over the course of time this could have a very substantial impact on the community.

所以,这种病毒在一段时间内,会对当地社会产生持续的影响

耶鲁公开课 - 生物医学工程探索课程节选

Well, the first thing that I noticed, they have been going wrong for a while.

据我观察，首先，这种状态其实已经持续了一段时间了。

普林斯顿公开课 - 国际座谈会课程节选