These tropisms, or affinities of viruses for certain cells, are well mapped out now.

如今病毒对特定细胞的趋向性和亲合力,已经很好地进行了描述

耶鲁公开课 - 生物医学工程探索课程节选

PROFESSOR: And this is a question based on where we left off on Wednesday -- we were talking about Coulomb's force law to describe the interaction between two particles and good job, most of you got this correct.

教授：这是我们上次最后,留下的问题-我们讲到,描述粒子间相互作用的,库伦定律，很好,大部分人都做对了。

麻省理工公开课 - 化学原理课程节选