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夜晚,当我们来到空旷(kuang)的草地上,会看到许多萤火虫在空中一闪一闪地飞舞(wu)。你知道萤火虫为什么会发光吗?它真的像童话里说的屁股后面有一盏(zhan)小灯吗?它为什么
At night, when we come to the kuang grassland, we see many fireflies dancing in the air. Do you know why the fireflies glow? Is it really like a little lantern behind the butt in the fairy tale? Why does it