There are fully fledged worlds such as Titan, as complex as any planet. There are possible havens for life, such as the ice-crusted water world Europa.
它们中有像土卫六(Titan)那样完全成熟的类型，复杂堪比任何一颗恒星，也有像被冰层包裹的木卫二(Europa)那样可能拥有生命体。
There are fully fledged worlds such as Titan, as complex as any planet. There are possible havens for life, such as the ice-crusted water world Europa.
它们中有像土卫六(Titan)那样完全成熟的类型，复杂堪比任何一颗恒星，也有像被冰层包裹的木卫二(Europa)那样可能拥有生命体。
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