The angle is increasing at a steady rate, so we know it's going at a steady speed.

转过的角度以恒定速率增加,所以我们知道它以一个恒定的速度运动

耶鲁公开课 - 基础物理课程节选

So, you picked up some speed, then you're coasting along at a steady speed.

所以当你加到一定速度,然后你便匀速上升的时候

耶鲁公开课 - 基础物理课程节选