Uranus is circled by a blue ring - a colour that makes it almost unique among planetary rings, which are usually red.

行星光环通常为红色，这使得天王星的蓝色光环显得独树一帜。

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Uranus is circled by a blue ring - a colour that makes it almost unique among planetary rings, which are usually red.

行星光环通常为红色，这使得天王星的蓝色光环显得独树一帜。

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