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树叶有它的生长环境,不同的树叶和它的生长环境是不同的。比如桃树的叶子很薄,水分很容易蒸发。一到秋天,雨水少了,树叶就落下了。
Leaves have its growth environment, different leaves and its growing environment is different. For example, the leaves of peach trees are very thin and the water evaporates easily. As soon as the rain fell, the leaves fell.