desalinate

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Energy and the technology to desalinate water are both expensive, and this means that desalinating water can be pretty costly.
淡化海水所需的能源和技术价格不菲，这就意味着海水淡化的代价极其昂贵。
That means it's still almost always cheaper to use local freshwater than to desalinate seawater. This price gap, however, is closing.
这就意味着在当地几乎总是可以找到比淡化海水更廉价的淡水，然而，这种价格差距正在消失。
So a nanotube membrane that allows both sodium and chloride ions (which are negatively charged) to flow out of seawater could become a cheaper way to desalinate water.
因此，这种纳米管膜，可以同时使钠离子和氯离子（这是带负电荷）从海水里分离，从而成为一个淡化海水的便宜方式。

To desalinate salt water, the technology passes it between two oppositely charged super capacitors, which attract charged ions.
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