Many of you have mapped the Moon phases over time with your eyes, your eyes being your more basic telescope.

我们当中很多人 都用观测过月相，很基础的望远镜。

Look at that phase diagram again.

再看看这个相。

This is what's called a phase diagram, and this one is for water.

这就所谓的相，这个水的相。

This phase diagram also shows us something else.

这个相还向我们展示了其他东西。

So, let's zoom out and sum up: When blocks collide, you can figure out how their velocities change by slicing a line through a circle in a velocity phase diagram, each curve representing a conservation law.

所以， 让我们放大点并总：当滑块碰撞时，你可以通过在速度相中的圆里画条线来确定它们的速度如何变化，每条曲线代表个守恒定律。

This phase diagram also shows us something else There's more than one way to melt ice You can raise the temperature We're all familiar with that way of melting.

这个相还向我们展示了其他些东西： 融冰的方法不止种 你可以提高温度 我们都熟悉这种融化的方式。

On a phase diagram, the critical point represents the maximum temperature and pressure where the substance can be a liquid.

在相中，临界点表示为 物质为液体时的最高温度和压力。