Because that is going to be a contour line, a line of equal elevation.

因为那将是一条等高线，一条等高程的线。

The best way to practice this is to simply do contour lines on everything.

练习这一点的最佳方法是简单所有东西上绘制轮廓线。

These contour lines represent how you should actually be placing your brushstrokes.

这些轮廓线代表您实际应该如何放置笔触。

Can you pick out something else about these contour lines?

你能从这些等高线中找出其他一些特点吗？

And I just apply it under and up with my light contour lines that I did before.

我只是将它应用我之前做过的浅色轮廓线上下。

And so that is why the contour lines will never cross.

因此，等高线永远不会相交。

And this is going to show the contour lines on the side.

这将面的等高线。

And so those are contour lines, lines of equal elevation.

那些就是等高线，即等高程的线。

And so before we get to that let's kind of go through the specifics of a contour line.

所以我们进入正题之前，让我们先了解一下等高线的具体细节。

And so what can we tell looking at those contour lines?

那么，通过观察这些等高线我们可以知道什么？

It is on the contour line, which is a line of equal elevation and therefore a line of equal gravitational potential energy.

它位于等高线上，等高线是一条等高的线，因此也是一条等重力势能的线。

And so in a topographic map those contour lines are going to show areas of equal elevation.

形图上，这些等高线会相同高度的区域。

And so those are contour lines.

这些都是等高线。

Again these contour lines are showing equal elevation and therefore equal gravitational potential energy.

这些等高线表的是等高，因此也表等重力势能。

Well we are going to use this idea of contour lines as an analogy to talk about equipotential lines in electric fields.

我们将使用等高线的概念作为类比来解释电场中的等势线。

And so did you learn to represent these contour lines as isolines?

那你学会用等值线来表这些等高线了吗？

So let me show you a quick activity I did to draw the contour lines.

所以让我展一下我快速完成的绘制等高线的活动。

And on a topographical map we call those contour lines.

形图上，我们称这些为等高线。

But on the sides, when those contour lines are really close together that means it is really steep.

但面，当那些等高线非常接近时，那就意味着那里非常陡峭。

So the way we did that was we took the contour lines from the existing mountains, and we took those lines and then translated them into a building.

所以我们这样做的方法是从现有的山脉中提取等高线，然后将这些线转化为建筑物。