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。

youdao

Eagle rock? A rock, you say? Oh, I see. It's obviously an outcrop of base rock.

鹰角石？你是说一块岩石？哦，我明白了。很显然是一块基石的露头。

youdao