But in practical purposes most of the time, they didn't-- they just mixed these together and they might use different things.

但实际上大多数情况下，她们并没有。。。,而是把财产混合在一起了。

耶鲁公开课 - 新约课程节选

But, he didn't use the term of electron.

但是他没有用电子这一术语。

麻省理工公开课 - 固态化学导论课程节选