"if one knows what's good for one" in Chinese (Simplified)
要是明白自己什么是最好的
Definition
用于警告或强烈建议的表达，意思是如果某人想避免麻烦或获得最佳结果，就应该按建议做。
Usage Notes (Chinese (Simplified))
这个短语常用于警告或强烈建议，有时带有威胁或严肃语气。“one”常用“you”或具体人名代替。多见于口语和影视作品中。
Examples
You should listen to the doctor if one knows what's good for one.
你要听医生的话，**要是明白自己什么是最好的**。
Stay inside during the storm if one knows what's good for one.
暴风雨时呆在屋里，**要是明白自己什么是最好的**。
Leave the dog alone if one knows what's good for one.
别惹那只狗，**要是明白自己什么是最好的**。
You'd better be on time, if one knows what's good for one.
最好准时到，**要是明白自己什么是最好的**。
Don't cross him if one knows what's good for one.
别惹他，**要是明白自己什么是最好的**。
Just keep your mouth shut about it, if one knows what's good for one.
最好别多嘴，**要是明白自己什么是最好的**。