我们首先要理解,移动到等值曲线的内部会发生什么？

So, well, maybe we want to understand first what happens if we move inside the level curve, OK?

youdao

由分钟降雨率等值线图和雨衰减等值曲线图，可以看出，降雨大的地方和雨衰减大的地方是一致的。

From the contour map of minute rainfall rate, we can see that, the he heavy rainfall areas are coincident with serious rain attenuation areas.

youdao

那么可以找到一条这个方向的曲线，而且这曲线位于等值面上。

Then, I can actually find a curve that goes in that direction, and stays on the level.

youdao