M-9：monkey business 不合法的行为
A:Do you know the tall man?
A：你认识那个高个子吗？
B:Which one? That one? I've just heard of him.
B：哪一个？那一个吗？我只听说过他。
A:I thought he was a brave and honest man.
A:我原以为他是个正直勇敢的人呢。
B:Isn't he?
B：他不是吗？
A:It is said that he is going on lots of monkey business.
A:据说，他在做些非法买卖。
