This is a colligative property.

这是依数性。

OK what are the four colligative properties?

那四种依数性到底是什么？

So we're going to start colligative properties.

现在我们开始来学依数性。

Any questions on azeotropes, before we get to colligative properties?

关于共沸混合物，有问题吗？，接着我们要讲依数性？

There are four colligative properties, and you already know what they are.

一共有4种依数性，你们已经知道它们是什么。