David Walker, head of the Nottingham Caves survey, surveys the base of Castle Rock, a large sandstone outcrop in the heart of the city.
大卫·沃克是诺丁汉洞穴勘测组的组长，他负责勘测石头城堡的地基，这是一块位于城市中心的巨型砂岩露头。
David Walker, head of the Nottingham Caves survey, surveys the base of Castle Rock, a large sandstone outcrop in the heart of the city.
大卫·沃克是诺丁汉洞穴勘测组的组长，他负责勘测石头城堡的地基，这是一块位于城市中心的巨型砂岩露头。
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