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海王星上有一个比地球还大的“黑眼睛”，它到底是什么？
你可能会问，海王星有黑眼睛？这是什么意思？难道海王星是一个大大的蓝色眼球吗？当然不是啦，海王星的“黑眼睛”其实是一个巨大的风暴，它在海王星上旋转着，就像一个深蓝色的瞳孔一样。
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