Specifically, Einstein's special theory of relativity predicts that time does not flow at a steady rate, and it can be affected by acceleration.

说得具体些，相对论预言，时间并不是按照一个固定频率流动的，它会受到加速度的影响。

youdao

We want to go to the acceleration at any moment in time just the way we did that with velocity.

关于任意时刻的，加速度，和讲速度的时候一样。

youdao

What is the acceleration in the y direction at time zero?

那y方向上,0时刻的加速度是多少？

youdao

Simply knowing the acceleration is not enough to tell you where it was at the initial time.

仅仅知道加速度是,不足以告诉你它在初始时刻的位移的

耶鲁公开课 - 基础物理课程节选

It knows that this particle happened to have a height of 15, at the time of 0, and a velocity of 10, and it is falling under gravity with an acceleration of -10.

这个质点恰好处在高度为15的地方,零时刻,初速为10,并在重力作用下以-10的加速度下坠

耶鲁公开课 - 基础物理课程节选