The results showed that petrochemical waste water and the polluted deep ground water all had significant mutagenicity on TA98. When S9 is not added, the mutagenicity was more significant.

结果表明，废水及其污染地下深井水对TA98均有较强的致突变作用，不加S9时突变性更强。

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The influx of cold air on top of warm, moist air favours the sort of deep convection that creates powerful storms, turning moisture in the air into water on the ground very efficiently.

寒冷的空气流入的温暖空气的顶端，潮湿的空气形成的深对流造成强烈的风暴，大气中的水分高效的形成降水于地面。

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A huge amount is in polar ice, which adds up to 1.7 per cent. A further 1.7 per cent lies in ground water deep beneath the land's surface.

有大量的淡水存在于两极的冰盖中，占到水总量的1.7%，还有1.7%是地下水。

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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

They say it will be able to walk at 2-3mph, carry 1, 00lb, travel over broken ground like rubble and rock piles, and cross water up to 8ft (2.4m) deep.

BBC: Ride-on giant robot 'Stompy' hits funding target