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A man got on a train and sit beside a woman. The woman was more than thirty year old. Soon they began talking to every other. He said to her, “Do you have a family？”“Yes，I have one son ” the woman replied to. “Oh, really?” said the man. “Does he smoke？”“No，”the man answered. “That’s good.” The man was glad to say, “I don’t smoke，too. Smoking is bad for your healthy. And does your son often fight with other?” “Oh, no.” the woman answered at once. “He never fights.” “Well,” the man said. “He is a good young man. But how old is he?” “Only three months old today.” The woman said with smile.