Even the Soviets learned what a bad idea it was to allow this to happen.

实际上苏联人也知道让这样的事情发生是个多么糟糕的主意。

youdao

I spend half an article explaining something, just so I can spend the rest of the article explaining what a bad idea it is to use the techniques you've just learned about.

我要在前半篇文章中解释某些东西，然后在后半篇文章中说明使用您刚刚才学会的那种技术是一个多么糟糕的主意。

youdao

This is probably a bad idea, but what the hey!

这大概是个馊主意，但管它呢！

《牛津词典》

What is a bad idea is the way it's been designed and certainly implemented.

NPR: Examining the Future of Medicare

What was a bad idea was all the money that was put out there, and that, in fact, was a huge problem.

FORBES: At GOP Debate In Arizona, Who Was Best On Education?

But regulating by placing specific conditions on individual license transfers is a bad idea no matter what.

FORBES: The FCC Scores a Hat Trick of Errors on Internet Regulation