not put a foot wrong别理解成“没有把一只脚放错”，其正确的含义是“不犯任何错误；不会做错”。

【例句】
Of course my sister can't put a foot wrong in our parents' eyes—she's the youngest child in the family.
当然，在我们父母的眼里我妹妹从来不犯任何错误--她是家里最小的孩子。

I'm just going2 to try my best not to put a foot wrong.
我要尽我最大努力不出错。