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有一年,美国华盛顿广场有名的杰弗逊纪念大厦,因年深日久,墙面出现了裂纹。为保护好这幢大厦,有关专家进行专门研讨。最初,大家认为损害建筑物表
One year, the famous Jefferson Memorial Building at Washington Square in the United States suffered from cracks in the walls as a result of years of age. To protect this building, the experts conducted a special seminar. Initially, everyone considered damage to the building list