That also cannot happen, so they're moving with the same acceleration.

这也不可能发生,所以它们以相同的加速度运动

耶鲁公开课 - 基础物理课程节选

it's happening. And I think it's happening, I think it's being sped up by humans, by our interaction.

这是一个正在发生的事实，由于人类的活动，这个进程在加速。

喜欢环境法课程 - SpeakingMax英语口语达人

Now, what happens if the elevator is accelerating upwards with an acceleration a?

现在如果电梯向上以加速度 a 运动,会发生什么呢

耶鲁公开课 - 基础物理课程节选