Some scholars argue that the concentration of water within the urban core of these sites provided a centralized source of political authority for Maya elites based largely on controlled water access.

一些学者认为，集中在这些地点的城市核心区的水资源为玛雅精英提供了一个集中的政治权力来源，而这些权力主要是基于对水资源的控制。

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Their resistance to outsourcing, concentration on core operations and production capabilities, and focus on the pulse of fashion have made them one of the most successful clothing retails.

他们拒绝外包，专注于核心业务和产能，以最新时尚为推动力，这些造就了服装零售业最成功的一个品牌。

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"The core of a pineapple contains twice the bromelain concentration of the surrounding fruit," says Dr Glenville.

格勒·威利博士指出：“菠萝果心的菠萝蛋白酶含量可是外层果肉的两倍。”

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