There's no formula here, a great deal depends on the overall pattern, what your TA tells me about how you've done over the course of the semester.

没什么公式，主要是看整体模式，助教告诉我关于这门课你这学期做得怎样。

耶鲁公开课 - 死亡课程节选

No, it's an exact formula.

不,这是精确等价的

耶鲁公开课 - 金融市场课程节选

So, that is a tricky problem to begin with because if you take this formula here, it tells you y if you know t, but no, we're not saying that.

以这个问题刚开始的时候有点难度,因为如果你要用这个公式,求y的时候就一定要知道t,但是,我们不知道

耶鲁公开课 - 基础物理课程节选