Ask for directions and up pops an arrow indicating which direction to begin driving or walking, along with the number of miles you should keep heading in that direction.

你问路之后，手表上会跳出一个箭头，指示开始往哪个方向开车或行走，以及你要接着往那个方向走多少英里。

youdao

Pick any two perpendicular directions Then the same entity, the same arrow which has an existence of its own, independent of axis, can be described by you and me using different numbers.

选取两个互相垂直的方向,这样同样的物体,同一矢量,并且是独立于坐标轴而存在的,可以被你和我用不同的数字来描述

耶鲁公开课 - 基础物理课程节选