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☆mad adj. 发疯
be mad/crazy about:为……而疯狂
be mad at sb
eg:Don't be mad at him。
别怪他（不关他的事）。
go+adj:变得
go mad/crazy/insane/bananas
Don't fight with him, he is a mad man.别跟他打架, 他是疯子。
1.疯的
The woman lost her son and got mad. 那个女人丢了孩子后疯了。
2.愚蠢的，不明智的（用于口语）
You must be mad to drive so fast! 你开这么快，简直是疯了！
3.非常生气的（口语）~at/with
He is mad with the dog for biting his new shoe. 狗咬了他的新鞋，他气得火冒三丈。
4.非常喜欢
So many people are mad on football. 很多人痴迷足球。
sum
名词 n. [C]
1.总数,总和,总计[the S][(+of)]
She paid the sum of $200 for dresses. 她买衣服总共花了二百元钱。
2.金额;一笔[(+of)]
He earned a large sum of money. 他赚了一大笔钱。
3.算术题;运算
The boy is good at doing a sum in his head. 这男孩善于心算。
