“海枯石烂”是形容耐久性的一句绝妙好词,实际上,“石烂”并不罕见,随着岁月迁移,埃及的狮身人面象表面剥落了,名胜古迹的残碑断碣上字迹模糊了,这都是石头腐烂的见证。混凝土是人造石头就免不了要烂掉。对于任何一种工程材料来说,只能要求在使用年限以内外貌不改、本质不变、结构不损、功能不衰,耐久性就算符合要 “Breathless” is a wonderful word to describe durability. In fact, “stone rotten” is not uncommon. As the years have shifted, the surface of Egyptian sphinx has been peeled off, and the monuments of historical sites and monuments are blurred. This is a testimony of stone decay. Concrete is artificial stone and it will inevitably rot. For any kind of engineering material, it can only be required within the service life, the appearance does not change, the essence is not changed, the structure is not damaged, the function is not bad, and the durability even meets the requirements.