unnecessary expense

不必要的花费：指没有必要发生的开支或费用。
常用释义
不必要的花费：指没有必要发生的开支或费用。

例句

I think this an unnecessary expense, but Lupin said he had had a piece of luck, having made three pounds out a private deal in the City.

我认为这是不必要的花费，但卢宾说他最近运气好，在城里做私人交易挣了三英磅。

在快速发展的中小型企业中，升级经常被视为不必要的开销。

Being 'green' provided useful marketing publicity though, at the time, many viewed CSR investment as an unnecessary expense.

但在那时，以绿色环保作为公共行销，许多观点认为公司的社会责任的投资是没有必要的费用。

Do not involve yourself in unnecessary expense.

勿做不必要的花费。

Don't involved yourself in unnecessary expense.

不要做不必要的花费。

这将成为一比没有必要的费用。

the driving factors are not simply those of need , but to do so cost - effectively avoiding waste and unnecessary expense

驱动的因素不仅是因为简单的需求，而且这样做可以有效的避免浪费和不必要的花费。