laugh line One day,from China, Japan, the United States three chefs who is used.Then they ask an umpire paticipate in a competition which is matching cut flies. First come on the stage is Japanese cook,only hear"chua chua",two flies were cut into two halves,the umpire grade 80 Second is American cook,two flies' wings were cut when hear"chua chua chua chua",and grade 90. The last appear on the scence is Chinese cook,only see a white light flashed,two flies still flying,the umpire catch the two flies and obsever it carefully,then grade 100. Japanese and American cooks are not convinced and they ask the umpire for reason.The referee explain:the flies were cut into double-fold eyelid 原文：有一天，中日美三国的三个厨师比谁刀法准，便请来一位裁判，比赛割苍蝇。第一位出场的是日本的厨师，只听见“欻欻”两声，两只苍蝇被割成了两半，裁判给打了80分。第二位出场的是美国的厨师，只听见“欻欻欻欻”四声，两只苍蝇被割掉了翅膀，裁判给打分90分。最后一位出场的是中国厨师，只见一道白光闪过，苍蝇仍在飞，裁判捉住苍蝇看了又看，给打了100分。日美两位厨师不服气，便去找裁判评理，裁判解释道：“苍蝇被割成了双眼皮”。