After 220 years of European settlement, the world's second-dryest continent (after Antarctica) is running out of surface water.

欧洲人登上这片土地220年之后，世界第二干旱的大陆(排在南极洲后面)正在耗尽它的地表水。

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Sand washing in horizontal Wells requires that the sand are carried out of surface without new damage on pay zones. This requires the reasonable flow rate and pressure in horizontal Wells.

水平井冲砂既要做到将砂粒冲出地面又不能在井底对储层造成新的污染，这就要求采取合理的水平井冲砂液流量和冲砂压力。

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In the late Middle Ages, it was customary to scrape away the surface of the parchment with an abrasive, which completely wiped out any writing that was there.

在中世纪后期，人们习惯用磨料刮去羊皮纸的表面，把纸上的所有文字都擦得干干净净。

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He points out that even the driest deserts on Earth have more water than the surface of the moon near its poles.

VOA: special.2009.09.30

It does so because there are some molecules in the surface of the membrane that allow glucose to move in and out.

而这个过程的完成依赖于,膜表面存在的一些分子,这些分子能够将葡萄糖运进或者运出细胞

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The reason you have to get it out of your head is you need to be able to see it on a surface that is not in your mind.

这么做的原因是,你需要,客观地观察它,而不是看它在你大脑中的样子。

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"They've got a run of asphalt that's coming out of the surface and, also, I did notice at least one pothole in the main wheel track of the road as well, which is surprising for a motorway surface, " Mr Bullock said.

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"The dispersant is moving the oil down out of the surface and into the deeper waters, where it can affect phytoplankton and other marine life, " said John Paul, a marine microbiologist at the University of South Florida.

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This process made cells spread out on the surface of culture plates, in a similar way to cancer cells moving out from a tumour.

BBC: NEWS | Health | Molecule 'helps cancer to spread'