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秋天是什么?夏天之后是秋天,这时天气慢慢转凉,白天慢慢变短。树上的叶子由夏天的绿色渐渐变成了黄色或是红色,最后从树上落了下来。
What is autumn? After the summer is autumn, when the weather turns cooler, shorter daytime slowly. The leaves on the tree gradually change from summer green to yellow or red, and finally fall from the tree.