Specifically, it has to be a nonporous surface like glass, without any tiny holes that the fluid can slip into.

尤其必须得是无孔表面，如玻璃，有任何小孔以致液体滑入。

Everyone has nonporous teeth and perfect eyesight.

有蛀牙 有。

Pots made of nonporous material like metal will retain more moisture, which is great for arid climates.

金属等无孔材料制成花盆会保留更多水分，这对干旱气候非常有用。