Mad money是“疯狂的钱”？

常言道：

君子爱财，取之有道：

A gentleman makes money in right way。

今天我们来学习一些与Money相关的一个英语习语

Mad money

其真正意思是：

a small sum of cash money kept aside or in reserve for emergencies, unforeseen expenses，备用金，俗称过河钱。

【例句】

Whenever we travel, my wife and I keep a small purse of mad money with us just in case we find ourselves in a difficult situation.

当我和妻子旅游的时候，总会准备一些备用金，以备不时之需。