Linguists can work at different levels of abstraction with language.

根据不同层面的基本单位，语言学家有不同的研究。

耶鲁公开课 - 文学理论导论课程节选

So we're going to think about - in the next few weeks we're going to think about the human organism at different levels of magnification and I've shown those levels here.

所以我们讲到,在接下来的几周里,我们将在不同的水平下,研究人类机体,我已经讲过这些水平了

耶鲁公开课 - 生物医学工程探索课程节选