Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.

地下水通常聚集在河流流域，但在干旱地区，地下水也可能完全保留在干涸河床的表面之下。

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Following the Mama Bongisa advice, they mounded the earth to get as much surface area as possible and to prevent Kinshasa's harsh rains from flooding the beds.

按妈妈促进会的建议，他们堆起土，尽可能地扩大面积并防止金沙萨的暴雨冲垮菜地。

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A major advantage of fluidised beds is that they provide a well mixed, high surface area, fluid-solid system which is useful for efficient reactions and heat transfer.

流化床的一大优点在于能产生一个充分混合的具有很大表面积的流体与固体的接触系统，这对高效反应和传热都很有用。

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Occurrences of flammable tap water, if not the result of existing gas transport pipelines, can be explained by totally unrelated gas leaks that occasionally occur around coal beds, which are far closer to the surface than natural gas deposits.

FORBES: Slurring Natural Gas With Flaming Faucets And Other Propaganda