The loop invariant what does the loop invariant mean? It says, here is a property that is true of this structure every time through the loop.

循环不变量是什么意思？,它是一个在结构体中,每次循环都为真的属性。

麻省理工公开课 - 计算机科学及编程导论课程节选

so every time there's a market, Monday, Wednesday, Friday, Saturday, I come here.

每次有市集的时候，周一，周三，周五，周六，我都会来。

在绿色市场 - SpeakingMax英语口语达人

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