You should have known better than to make such a ridiculous mistake.

你早该明白的话就不会犯这样荒唐的错误了。

youdao

I should have known better than to take my four-year-old son shopping with me.

我早该知道的，带我5岁的儿子去超市不是什么好主意。

youdao

And besides, you should have known better than to choose such a rush of a lass!

另外，你不该选这么一个薄命的姑娘。

youdao

You should have known better.

你早该知道的。

I should have 实战 - SpeakingMax英语口语达人

I should have known better.

我早该知道的。

I should have 课堂 - SpeakingMax英语口语达人

To be fair to Draghi, people getting excited about this meeting should have known better.

FORBES: ECB : We'll Do What It Takes. Kinda. Sorta. Later.

After decades of work in radio, music and popular culture, I should have known better.

FORBES: Tribune's Lee Abrams Defends Himself: "I Will Not Stop Pushing"

"There's no disguising that this is a business that should have known better, " Mr Smith added.

BBC: Sony fined over 'preventable' PlayStation data hack