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The teacher is telling her students the importance（重要性）of making other happy. "Now, children," she says, "did you make other people happy?" A small boy says, "I made someone happy yesterday." "Well done. Who was that?" asks the teacher. "My grandma," says the boy. "Good boy. Now tell us how you made your grandmother happy," asks the teacher. "I went to see her yesterday, and stayed with her for three hours. Then I said to her," Grandma, I'm going home." And she said, "Well, I'm happy!"