rotary sand drier 卧式烘砂滚筒
Water in the sand between the two POTS evaporates through the surface of the larger pot, where drier outside air is moving.
两个罐子中间沙子的水分通过大罐的表面蒸发，使大罐外部的干燥空气开始流动。
Water in the sand between the two POTS evaporates through the surface of the larger pot, where drier outside air is moving.
两罐之间的沙子中的水分经由大罐的表面蒸发，使大罐外部的干燥空气开始流动。
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