This freeze-thaw cycle, a common form of erosion of natural rocks, too, weakens a structure directly and also exposes steel reinforcing rods to water, causing them to rust.

• 这种作为侵蚀天然岩石的常见形式的冻融循环，同样会直接削弱建筑物，并且还使钢筋条与水接触而导致他们生锈。