Answer: On the eve of the Spring Festival, a green leather train from Shanghai to Sichuan was crowded with returning migrant workers, because it was the peak of Spring Festival travel rush. No matter friends or strangers on the train, as long as the seats are close, everyone is talking eagerly. The carriages are full of laughter and laughter, and the flavor of the year is getting stronger and stronger. It's six o'clock in the evening, which is just the time to eat. A young girl in her early twenties, pushing a dining car and carrying a box lunch, came slowly from one end of the carriage. "Come on, come on, hot box lunch, two meats and two dishes, come and buy!" This trolley has four compartments for vegetables and one compartment for rice. When cooking and cooking, the cloth used for heat preservation is uncovered, and the food smells fragrant for a while, attracting hungry people to buy it one after another. When the little girl pushed the car to the last row, an old man in his fifties whispered, "How much is the box lunch?" The little girl smiled and replied, "Grandpa, there are 20 boxes of lunch. The dish has just come out of the pot and it is still hot. " Grandpa muttered, "A few years ago, when I took the bus, it was only ten yuan a box. How can it be so expensive? " The little girl said, "oh, grandpa, the price of raw materials has gone up sharply now." You are talking about the price a few years ago. " Grandpa then said to his aunt, "Buy more instant noodles when you leave, or listen to me!" " It is easier to spend money than to earn money. My little grandson is going to college this year. I heard that college tuition is very expensive. Save it. "After the uncle and aunt finished talking, they turned to the little girl and said," Well, I want a box, you give me an extra pair of chopsticks, and my wife and I can eat one. " The little girl looked at the wrinkled and gray faces of the old couple and couldn't help feeling a little sad. After receiving my uncle's money, I said, "My own grandparents should be about your age. "Finished eating, on the table in front of the old couple. Two boxes of white rice are full. The food in that box is piled up like a hill, and the lid of the lunch box can't be buckled, even if there is more. The old couple were speechless when they saw that the meal was twice the normal weight. They just kept nodding their thanks with their fists. The little girl smiled and waved her hand and said, "Eat quickly, or it will get cold." Keep pushing the car and walk to the next car.