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With the decreasing of using ink, the graduation of scale on the pen changes. It seems to predict the decreasing source, the increasing temperature, the increasing carbon-dioxide. The earth is getting deteriorated. When ink is used up, pen won’t use any more, just like the exhaustion of resources on the earth. From this process, we can learn that we should save resources from little things, treasure our earth.This pen just likes our earth. Before using it . it’s vitality grass on the pen’s surface. With the decreasing of ink, the grass turns into dry land. After using up, the words of “treasure our earth” turned up.