" Know something back to front" . To know something back to front is to know something very well.

Know something back to front 的意思是对某事非常了解。

So, to know something back to front is to know something very well.

所以，to know something back to front 就是非常了解某事。

But if mirrors flip back to front, then why does text look reversed left to right?

但是如果镜子从后向前翻转，那么为什么文字看起来从左到右颠倒了呢？

So, for example, " I know education back to front" ; " I've read this book five times, I know it back to front."

例如，“我对教育了如十分了解”；" 这本书我已经读了五遍，从头到尾都读懂了。"

You've got that matinee jacket completely back to front!

你把日场夹克完全反了过来！

You’ve got your sweater on back to front.

【back】你把毛衣前后穿反了。

He got the commands back to front and the program didn’t work.

【back】他把指令颠倒了，程序没有运行。

I don't know why because if your T-shirt is back to front, you obviously don't know it very well, but it means you do, right ?

我不知道为什么，因为如果你的 T 恤前后颠倒了，你显然不太清楚，但这个短语的意思是你知道。

" Back to front" , we talk about, for example, if you put a T-shirt and the the back comes to the front and the front goes to the back, right? Then, it's back to front.

Back to front，当我们说，例如，如果你穿一件 T 恤的时候把后面穿到前面，前面穿到后面，那么，它就是前后颠倒了。

" Well, Barty knows the rule book back to front, " said Bagman, beaming and turning back to Karkaroff and Madame Maxime, as though the matter was now closed.

“嘿，巴蒂把章程背得滚瓜烂熟。”巴格曼说，脸上绽开笑容，回过头来望着卡卡洛夫和马克西姆夫人，似乎事情已经圆满解决了。

They turned their pinafores back to front, and went up with a skip and a jump; Moppet's white tucker fell down into the road.

她们把围裙翻到前面，蹦蹦跳跳地跳了起来。 Moppet 的白色裙子掉到路上。

Casper also devised another code: a triangular advertising sign on the shop window meant that it was safe to come in, if it was placed back to front, it meant that it was better to wait.

卡斯珀设计了另一个暗号: 商店橱窗上的一个三角形广告标志意味着进来是安全的，如果把它放在后面，那就意味着最好等着。