But to be mad as a March hare means that someone is completely mad, or crazy.

但" to be mad as a March hare" 的是指某人彻底疯了。

As with many expressions found in Carroll's books mad as a March hare appeared in other places long before the publication of his book.

正如出自卡罗尔作品的其他表达一样，" mad as a March hare" 这个表达在卡罗尔的作品出版之前早就出现在了其他地方。

I turned and looked into her eyes and knew instantly what I should have known before, that she was as mad as a March hare.

我转身看着她的眼睛，立刻明白了我早该知道的事情，她像三月兔一样发疯。