Suppose we all go to a tall building and start throwing things at various times and various speeds.

假设我们都爬上一栋高楼,在不同时刻以不同速度抛出物体

耶鲁公开课 - 基础物理课程节选

But the objects are at different locations at a given time.

但是它们在同一时刻分别在不同的位置

耶鲁公开课 - 基础物理课程节选