German beer has traditionally been made from just four ingredients – hops, malt, yeast, and water.

德国啤酒传统上一直是只由4种原料酿造而成的–啤酒花、麦芽、酵母和水。

《柯林斯英汉双解大词典》

While we have ample supplies of water because of the four different sources of water that we now have, we do want people to realize that this don't come easy.

虽然我们现在的水供给很充裕，因为我们现在有四种途径来获得水源，我们想让人们明白它的来之不易。

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Add four drops of red food coloring to the water above the hot cup and four drops of blue food coloring to the water above the cold cup.

从热杯子上方向水中加四滴红色食用色素，从冷杯子上方往水中加四滴蓝色食用色素。

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They observed that for every molecule of carbon dioxide taken in by the plants, they lost forty-four percent less water.

VOA: special.2010.01.26

The same four essential ingredients - flour,water,yeast and salt - can yield 10,000 different combinations.

VOA: standard.2010.07.16

The large hole is believed to have been caused by three small leaks on a four-inch water pipe.

BBC: Dundee's Albert Street reopens after huge void find

More than four-fifths of the river water taken from the Murray-Darling basin is used for agriculture.

ECONOMIST: Australia's water war

Step by step - as with the passage of Cobell and the four historic water rights settlements - we are getting there.

WHITEHOUSE: Fulfilling Our Promise in Indian Country