In that case, we understand it as a sequence of cross-sections rather than something that somehow organically changes through time.

这样，我们就是在学习一个个语言的横截面,而不是语言自然的变化过程。

耶鲁公开课 - 文学理论导论课程节选

So it was just a natural progression really because I've lived here for quite a while.

所以这真的只是一个自然的过程，因为我在这儿生活了一段时间了。

伦敦的出租车司机 - SpeakingMax英语口语达人