Tiles can be fixed to any surface as long as it's flat, firm and dry.
瓷砖可以固定在任何表面上，只要这些表面是平整、坚固、干燥的。
It is held there by the force of surface tension without which water would drain instantly from any wet surface, leaving it totally dry.
它是由表面张力的力量保持的，没有它，水会立即从任何潮湿的表面流失，使它完全干燥。
Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.
地下水通常聚集在河流流域，但在干旱地区，地下水也可能完全保留在干涸河床的表面之下。
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