“I'm sorry ，Madam ，but I shall have to charge you twenty dollars for pulling your boy's tooth .” “Twenty d ollars! Why ，I understand you to say that you charged only four dollars for such work!” “Yes ，but this youngster yelled so terribly that he scared four other patients out of the office .” “对不起，夫人，为您孩子拔牙我要收取20美元。” “20美元！为什么不是说好只要4美元。” “是的，但是你的孩子大喊大叫，把另外四个病人吓跑了。” TWO： Teacher：We all know that beat causes an object to expand an cold cauese it to contract. Now，can anyone give me a good example? John：Well ，in the summer the days are long，and in the winter the days are short. 老师：我们都知道热胀冷缩的道理。现在，谁给我举个例子 约翰：嗯，在夏天天都长，在冬天天都短。
