“对不起，夫人，为您孩子拔牙我要收取20美元。”
"I'm sorry, Madam, but I shall have to charge you twenty dollars for pulling your boy's tooth."
“20美元！为什么？不是说好只要4美元。”
"Twenty dollars! Why, I understand you to say that you charged only four dollars for such work!"
“是的，但是你的孩子大喊大叫，把另外四个病人吓跑了。”
"Yes, but this youngster yelled so terribly that he scared four other patients out of the office."