Because of the vacuum, the boiling point of the liquid is 8 than it would be under normal atmospheric pressure. This effect is known from the mountains: as the atmospheric pressure 9 is lower than in the valley, water boils at temperatures 10 below 100℃. The evaporated, non-saline water is condensed and runs down through a completely filled tube in a controlled manner. The gravity of this water column continuously produces the vacuum and so a vacuum pump is not needed. The reconcentrated brine runs down the tower surface 11 to absorb moisture from the air.

　　The concept is suitable for various water 12 Single-person units and plants 13 water to entire hotels are conceivable, says Egner. Prototypes have been built for both system components-air moisture absorption and vacuum evaporation-and the research scientists have already 14 their interplay on a laboratory scale. In a further step the researchers in-tend to develop a demonstration 15.

　　练习：

　　1. A dry

　　B dirty

　　C sandy

　　D clean

　　2. A path

　　B way

　　C channel

　　D road

　　3. A oil

　　B wood

　　C coal

　　D solar

　　4. A when

　　B what

　　C where

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