According to the indicative role of Protozoa, the author have judged the polluting degree of wastewater of electroplate, paper making, machinery, woolen and the mixed wastewater on surface of ground.

根据各监测性原生动物的指示作用、判明了电镀、造纸、机械、毛纺及地面混合污水的污染级别。

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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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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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When there is fresh snow on the ground, the surface of the snow takes in, or absorbs,sound waves.

VOA: special.2010.01.05

Alex Scott, SNH area officer for West Sutherland and Wester Ross (North), said the caves provided a unique record of Scotland's ancient history, as glaciers during the Ice Age erased many remains buried just below the surface of the ground.

BBC: NEWS | UK | Scotland | Highlands and Islands | New tests on rare polar bear find

Flowing hazardous chemicals(fracking fluid) poisoning land throughout how many miles of ground and surface water from the Gas Well Site?

FORBES: Don't sign the wrong fracking petition

The company has had to raise capital in order to invest in pulling that oil out of the ground, thousands of feet below the surface of the ocean, and another thousand feet below rock and sand.

FORBES: Barclays Reiterates Overweight on Brazil's Petrobras