Of course, I have discretionary income.

当然，我有可自由支配的收入。

How much extra discretionary income is there?

有多少可供你你额外自由支配的钱呢？

'a lot of my discretionary income was... going into air,' says Ms.

“我的可支配收入很多都花在冷气上了，”瑞芭说。

We have more discretionary income than most other travelers and more time to spend it.

我们比其他旅游者有更多的可用收入和更长的旅游时间。

An essential characteristic is the possession of a reasonable amount of discretionary income.

中产阶级的一个基本特点是，拥有相当数量的可支配性收入。