石头是她的爷爷,石灰是她的爸爸,她的爷爷只能托起摩天大楼,她的爸爸只能驱除一切杂色,而她却能将人类的灵魂美化。她在老师的手中跳跃,变成知识的花环;她在宽大的黑板上燃烧,化为思想的火苗……她象一座桥梁,让学生跨越知识的第一道河流; Stone is her grandfather, lime is her father, her grandfather can only hold the skyscraper, her father can only get rid of all the variegated, but she can beautify the human soul. She jumps in the hands of a teacher and becomes a garland of knowledge; she burns on a broad blackboard and becomes a flame of thought ... She is like a bridge that allows students to cross the first river of knowledge;