“Look at this dead yellow earth, ” said Li Jiaying, 67, a hunched woman hobbling to her new concrete home clutching a sickle and a bundle of dry sticks for firewood.

“看看这干黄的地表，”67岁地李佳英（音译）说，这位背部微驼的老妇手拿镰刀和木柴，步履蹒跚的走向她的混凝土新居。

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The shelter has air conditioning, electric lighting, and is roofed with 4 ft. of reinforced concrete surmounted by several feet of earth. Here, Nearco is shown being led out of his shelter.

这个掩体装有空调和电灯，顶部采用4英尺厚的混凝土加固，上面还覆盖着数英尺厚的土。

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With climate change, concrete deserts and agriculture, human beings have fundamentally altered the face of the Earth.

随着气候的变化以及土壤沙漠化，人类从根本上改变了地球的表面。

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In August 2011, Speth and his chief engineer finally broke through more than two meters of earth and reinforced concrete and the shelter's 278-millimeter-thick ceiling to emerge into a 40-square-meter space, divided into five interconnecting rooms by heavy metals doors.

CNN: Vietnam War bunker reopened under luxury hotel

They are also working on active penetrators bombs which can tunnel through hundreds of metres of earth, rock and concrete.

ECONOMIST: Bunker-busting

The faint traces of concrete foundations in the earth are a poignant reminder of the town that has been lost.

ECONOMIST: Japan after the 3/11 disaster