2--No，thank you. I'm on a diet.
 
1--Why? You're not fat.
 
2--I'm  considering  entering  for  the beauty contest this summer, so I must have a slender figure.
 
1--Women  of  all  shapes  would  be beautiful if they are self-confident.
 
2--I'm afraid the judges do not think so. All the beauty contests are for slim girls only.
 
1--Well.There's a beauty contest in Thailand just for fat beauties.
 
2--How much do they weigh?
 
1--All the beauties who entered the contest were over 80kg.
 
2--But I'm not fat enough to enter that contest.
 
===================================
注解：
 
1.on a diet在节食
2.slender苗条的  
3.self-confident自信的
 
===================================
译文：
 
1--要来一块蛋糕吗?
2--不，谢谢。我在节食。
1--为什么?你又不胖。
2--我想参加今年夏天的选美比赛，所以我得有一个苗条的身材。
1--只要有自信，各种体形的女人都很美。
2--恐怕评委不这么想。所有的选美比赛都只为苗条的女孩敞开大门。
1--泰国有一个选美比赛是专门为胖美人们而设的。
2--她们有多重?
1--所有的参赛选手都超过80公斤。
2--但我不够胖，参加不了那个比赛。