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。

youdao

So what we do is to keep water in the core itself, not just in the containment.

所以，我们要做的就是将水保持在核心里面，而不只是在容器里面。

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Water surrounding the core boils into steam that drives turbines to generate electricity.

核心周围的水沸腾后变成水蒸气，推动涡轮从而发电。

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During this violent time, much of the debris would have resembled comets - dirty snowballs thought to be mostly slushy water surrounding a rocky core - slamming into Earth at velocities greater than 25 km per second (16 miles per second).

BBC: Comets could have seeded life on Earth

Balance is a crucial skill for surfers and one reason that many people who surf do exercises that strengthen the core in their out-of-water workouts.

WSJ: For the Love of Surfing and Wine Country

At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.

CNN: Today/Tomorrow - Helping nuclear plants keep their cool