It's called the production possibilities frontier, or PPF.

它叫做生产可能性边界（PPF）。

The PPF shows the different combinations of two goods being produced using all resources efficiently.

PPF表示利用所有资源高效生产的两种商品的不同组合。

PPF is an example of a tip, a trick, a shortcut.

PPF 是提示、技巧和捷径的一个例子。

An example of this is something that we often see, which is PPF.

这方面的一个例子就是我们经常看到的东西，就是 PPF。

Now, when I was teaching at the British Council more than 10 years ago, we would teach PPF and which is past present future.

现在，当我 10 多年前在英国文化协会任教时，我们会教授 PPF， 这是过去现在的未来。

So if you are memorizing answers in part one, and then you think that you're going to trick the examiner using PPF and then some other trick in part three, the examiner has seen it a hundred times.

因此，如果您正在记住第一部分的答案，然后您认为您将使用 PPF 来欺骗考官， 然后在第三部分中使用其他一些技巧，那么考官已经看过一百次了。