So, the question we want to answer is, what is the position at time t, so, the point q?

于是，我们要解决的问题是，当时刻为t的时候，点q在哪？

youdao

So, the question we want to answer is, what is the position at time t, so, the point q?

于是，我们要解决的问题是，当时刻为t的时候，点q在哪？

youdao