阅读下面的材料,按后面的要求作文。一个寒冷的冬天里,父子俩寻找柴火,父亲找到一颗死树,然后就把它锯倒了。到了春天,父亲惊讶地发现,那棵树残存的树干周围发出了新芽。父亲对孩子说,“我以为它肯定死了。冬天里树叶都落光,天气又那么冷,嫩枝都折断了,似乎那棵老树上不再存在任何生命。可事实上这棵树却依然保存着生命的活力。”父亲最后感慨地说,“别忘了这个教训,不要在冬天砍倒一棵树。” Read the following material, according to the requirements behind the composition. A cold winter, the father and son looking for firewood, his father found a dead tree, and then saw it down. In the spring, my father was surprised to find that new shoots sprouted around the remaining trunk of the tree. My father said to the child, “I thought it must have died.When the leaves were falling and the weather was so cold in winter, the twigs were broken, as if the tree no longer existed anymore. But still preserved the vitality of life. ”“ Father finally said with emotion, ”Do not forget this lesson, do not cut down a tree in the winter. "