美国首都华盛顿广场的杰斐逊纪念馆大厦年久日深,建筑物表面斑驳陆离,后来竟然出现裂痕。对于这个标志性建筑的破败,政府极为重视,也采取了很多措施进行补救,但仍然无法遏制事态的恶化。后来专家调查发现:冲刷墙壁所含 The Jefferson Memorial Building at Washington Square in the U.S. capital has been aging for so long that the surface of the building is mottled and then cracked. For the dilapidated landmarks of this landmark building, the government attached great importance to it and took many measures to remedy the situation. However, it still can not stop the deterioration of the situation. Later experts found that: scouring walls contained