Ideally, a large proportion of rainfall should be absorbed by the ground. Clearly, such a process is not possible on a hard surface.

大部分降雨理论上应该被地面吸收，对硬地面来说显然不行。

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In this method of farming seeds and fertilizer are put into the soil through small cuts made in the surface of the ground.

在这种耕作方法中，种子和肥料是通过地面上的小切口进入土壤的。

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Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery.

大多数地面调查都需要走很多的路，寻找一些表面上的线索，比如陶器的小碎片。

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The islands natural surface and ground-water resources can only cover about 10% of the demand at present.

UNESCO: MEDIA SERVICES

Less than a mile above the crater, it sweeps the surface with ground-probing radar and begins its descent: a hundred miles per hour, fifty, twenty.

NEWYORKER: The Martian Chroniclers

Mirra deep cleans any type of in-ground pool surface and water without using the pool's filtration system, hoses or booster pumps, which results in energy cost savings from running these pool systems less frequently.

ENGADGET: iRobot flaunts the Mirra 530 pool cleaning robot, sends the Looj 330 abroad