孤獨的探險者坐在巨大環形世界的清澈河邊，環帶彎向天空，遠處有巨型建築與明亮恆星

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A serene scene on a massive artificial ringworld: a lone explorer sitting by a crystal-clear river with a breathtaking view of the ring curving into the sky, distant megastructures, and a bright central star. Soft golden hour lighting, lush vegetation, sense of wonder and scale. Cinematic landscape, hard sci-fi inspired by Larry Niven, ultra-realistic, peaceful yet epic.