put a foot wrong不是指“把一只脚放错”，真实含义是不犯任何错误；做错事；犯错误。

【例句】
He glided smoothly through his news conference, never putting a foot wrong.
他平稳地度过了新闻发布会，没有犯任何错误。

In all the delicate negotiations, the diplomat never put a foot wrong.
在微妙的谈判中，这位外交家从未出过差错。