As the water evaporates, a crust of salt is left on the surface of the soil.

水蒸发后，土壤表面留下一层盐。

《柯林斯英汉双解大词典》

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。

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Perhaps the flow of water rearranges dirt particles on the surface, or maybe the streaks are the residue left behind when the briny water evaporates.

也许是水流重新排列了其表面的尘埃，或者也许这些条纹是这些盐水蒸发后所留下的残迹。

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

VOA: special.2009.02.09

As loaves are usually wrapped in plastic, any water in the bread that evaporates from within is trapped and makes the surface moist.

BBC: Bread that lasts for 60 days could cut food waste