"It's definitely a relief to us who lives in here because of what's happening, when everything is over we will be able to go back to Haiti without worry, with knowing OK, without nothing bad happening, we'll feel like we're safe over there and then come again back to America safely."

VOA: special.2010.02.01

That's why we don't have an arrow here, because we could go back, this way too.

这就是为什么我们这里没有用箭头的原因，因为我们可以过渡回去，像这样。

麻省理工公开课 - 热力学与动力学课程节选

So, that's sort of the mathematically how we get to a, but we can also just look at the graph here, because every time we go one wavelength we can see that we're back in a maximum.

这是就我们得到a的数学,办法，但我们可以直接,从图上看，因为每次我们,经过一个波长，都回到一个最大值。

麻省理工公开课 - 化学原理课程节选

Now, we are done because now we can ask how high does it go, and you go back to your y of 1 is 15+10-5, which is what?

现在问题解决了,因为我们可以算出,最高点的高度,你回到这个式子,求出y=15+10-5,是多少

耶鲁公开课 - 基础物理课程节选