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        "quote": "宇宙学是把宇宙作为一个整体来研究[18]。通常假定，在最广泛的观测尺度上，宇宙是均匀且各向同性的——没有特定的位置或方向被 突出。假设广义相对论在这一整体尺度上适用，则具有均匀且各向同性空间截面的度量称为平坦<u class=\"concept-term\" data-concept-identity=\"urn:uuid:08c2620a-3da7-4383-ba7c-e217b3d97685\" data-concept-route=\"/concept-identities#concept-08c2620a-3da7-4383-ba7c-e217b3d97685\" id=\"first-b4ad1643f2dc9ff3a6a0-zh\">罗伯逊–沃克模型(Robertson–Walker model)</u>。其中最简单的是所谓的平坦模型",
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