Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.

 
  • 兩個(gè)罐子中間沙子中的水通過(guò)大罐子表面蒸發(fā)掉,不斷蒸發(fā)到外面干燥的空氣中。
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