Water in the sand between the 2 pots evaporates through the surface of the larger pot, where drier outside air is moving.

 
  • 2個(gè)罐子之間沙子中的水分會(huì )透過(guò)大罐子的表面蒸發(fā)掉,當外面較干燥的空氣在流動(dòng)時(shí)。
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