Observe the evaporation of a drop of table salt solution on a warm hydrophobic surface. After the water evaporates, a variety of characteristic crystal shapes remain. Research and explain this phenomenon.

观察一滴食盐溶液在温暖疏水表面的蒸发过程。待水分完全蒸发后，表面会留下形态各异的特征晶体结构。请探究并解释这一现象。