New York is different. It's still diverse but not as diverse as L.A., I feel like.

纽约就不同了。纽约也很多元化，但和洛杉矶相比还差一些。

纽约和洛杉矶不一样 - SpeakingMax英语口语达人

Because the difference in the vector between two times is this vector.

因为两个不同时间点上矢量的差,就是这个矢量 ΔR

耶鲁公开课 - 基础物理课程节选