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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The heart of every application is the base model that describes it -- a domain model, class model, logical model, entity model, or the like.

每一个应用系统的核心是描述这个系统的基础模型 -- 领域模型、类模型、逻辑模型、实体模型等等。

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A higher number of deepened periodontal pockets (infection of the gum around the base of the tooth) had a 53 percent increased risk of heart attack compared to those with the fewest pockets.

牙周袋（牙根周围牙龈感染）多的比牙周袋最少的心脏病风险高53%；

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Then, we are on the ground within the high boundary walls of the military base and right in the heart of Helmand province.

BBC: Afghanistan: Landing in the camp

He has specifically criticised some of Mr Berezovsky's dealings in a way that would have seemed inconceivable in past years, when the tycoon seemed to have a base at the heart of the Kremlin.

ECONOMIST: Boris Berezovsky, puppeteer or future victim?

The inherent love of baseball will always replenish and find its way to the heart of its designated fan base.

FORBES: Move up http://i.forbesimg.com t Move down