costly error

代价高昂的错误：指因犯错而导致的严重后果或损失。
常用释义
代价高昂的错误：指因犯错而导致的严重后果或损失。

例句

Going into that business at such a time was a costly error, and Smith has been paying through the nose ever since.

在那样的时候，从事那种事业是个大错误，史密斯自此以后即一直为此付出很大的代价。

It is just the nature of the business, where the slightest distraction may result in costly error.

这个行业就是这样，丝毫疏忽都会导致巨额的损失。