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It's a rainy day. A woman gets on a bus with a dog. It is a big dog. Its feet are very dirty. The woman says , "Oh , conductor（售货员）， if I buy a ticket for my dog, can he have a seat like the other people? The conductor looks at the woman and then he says，"Certainly，Madam. He can have a seat like all the other people on the bus, but he must not put his feet on the seat like the other people on the bus."