Niagara Waterfalls are 670 metres in width and fall 56 metres in an awesome sheet of water.

尼亚加拉瀑布宽670米，白色水幕飞流直下56米，令人叹为观止。

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They had been walking for nearly two hours when they came to a large sheet of water.

他们走了将近两个小时时，他们来到了一大片水域前。

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The figure trudged, or rather sloshed, onwards till the hill resumed and the treacherous sheet of water was left behind.

这人艰难地跋涉着、或者说是踉跄着一直向前，将这座小山和讨厌的水洼甩在了身后。

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But a good chunk of it is swampland. The famous Everglades, a slow-moving sheet of water full of plants and alligators, cover much of the southern part of the state.

VOA: standard.2010.03.29

They all come from the Greenland ice sheet, a vast mass of frozen fresh water, hundreds of miles across and up to two miles thick.

CNN: Greenland's frozen landscape warming up

They used satellite data concentrating on Greenland's coastline to examine how fast the thinning is happening, and they have found that the flow-speed of 12 glaciers, which together account for about half the discharge of water from the ice sheet, is increasing and fast.

ECONOMIST: Climate change (II)

Next week, if all goes according to plan, a small mountain of snow will be melted, repeatedly sterilised and then injected in a high-pressure stream of near-boiling water to clear a bore-hole through the two miles of the ice-sheet.

BBC: New age of exploration in the hunt for extreme life