这意味着如果我们在这点观察运动的轨迹，它的加速度是指向这个方向的。

So, what that means is that if I look at my trajectory at this point, that the acceleration vector is pointing in that direction.

youdao

阅读时用手指或笔尖指向文章字句并快速移动来迫使我们的眼睛快速随手指或笔尖移动来强化我们的阅读速度。

When reading articles, we can point at the words with our finger or pen point and our eyes move with the finger quickly so that we are able to read very fast.

youdao

要促使速度矢量，产生如此的变化，所需的加速度，总是指向圆心。

This acceleration that is necessary to make the change in the velocity vector is always pointing towards the center of the circle.

youdao

The tangent's pointing towards the direction you are headed at that instant.

切线的方向就是,速度矢量在那个瞬时的指向

耶鲁公开课 - 基础物理课程节选