What I'm also taking in, try at least to take in everything around me, perceiving a lot of people.

我还在吸收，试图吸收周围的所有事物，感知许多人。

麻省理工公开课 - 电影哲学课程节选

Mathematically, it's done by taking the expression for R and differentiating everything in sight that can be differentiated as vector t.

从数学上看是这样的,写出 R 的表达式,并对所有可以进行矢量微分的部分,对时间 t 求微商

耶鲁公开课 - 基础物理课程节选