And in terms of equations that we use, it's sometimes easier to plug in the fact, since momentum is equal to mass times velocity.

在我们使用方程这方面，事实上有时是很容易代入的，因为动量等于质量乘以速度。

麻省理工公开课 - 化学原理课程节选

It is essentially equal to internal energy for condensed systems, but when you look in the books sometimes they will use this term.

它与内能是相同的,在凝聚体系中，在你看书时有时你会发现,它们会这样使用。

麻省理工公开课 - 固态化学导论课程节选

Leisure does not simply mean rest or inactivity but leisure is necessary for education or what he sometimes calls by the term philosophy.

安逸不单意指休憩或静止不动,安逸是教育的必备条件,或是套用,他有时会使用的词汇－哲学。

耶鲁公开课 - 政治哲学导论课程节选