2. MAD AS A HATTER
Mad as a hatter is to suggest that a person is suffering from insanity. The phrase had been in use since 1835 to describe an unusual medical condition affecting hat manufacturers.
Mad as a hatter指一个人出现精神错乱。从1835年起，这个短语就用来形容一种帽子制作者身上患有的病症。
In 18th and 19th century England mercury was used in the production of felt, which was used in the manufacturing of hats common of the time.
一些帽子手工匠因长期接触含汞织物而发生汞中毒，口齿不清、战栗、步履蹒跚、甚至失去意识，而人们就用mad as a hatter来形容出现这类症状的人。
“He was the first children’s book author to license his characters for use on other products, so the characters had individual lives,” says Vega, “The characters become familiar to a group of people wider than the readership of the book.”