1、How much extra discretionary income is there?
有多少可供你你額外自由支配的錢呢？

2、'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氣上了，”瑞芭說。

3、We have more discretionary income than most other travelers and more time to spend it.
我們比其他旅游者有更多的可用收入和更長的旅游時間。

discretionary income翻譯