Just let me get you out of here first,all right? It's my dad! We have to go back!

VOA: standard.other

He said, first, let it go a little distance, take the distance over time, that gives you the velocity now.

他说,首先,让它运动一小段距离,距离除以时间,你就能得到现在的速度

耶鲁公开课 - 基础物理课程节选

For a first pass, let's just say for condensed systems we can go with it.

对于第一步，在凝聚体系中我们可以这样认为二者是相同的。

麻省理工公开课 - 固态化学导论课程节选