经被重建或修复。由于像沙尘暴这样的自然灾害，这些遗留下的建筑遭受到很大的破坏。很多研究者和学者在寻找方法保护这些文化遗产(relics)。无疑， 越来越多的人意识到这些文化遗产的伟大意义(significance)并加入到保护它们的行列中。

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　　【参考范文】

　　People from ancient civilization founded many famous buildings.Unfortunately, some of them gradually fall in ruins, while some remain today.In memory of these lost civilizations, some of them have been rebuilt or repaired according to the documents.Because of natural disasters like sandstorms, the remaining buildings are greatly destroyed.Many researchers and scholars are looking for solutions to protecting these cultural relics.There is no doubt that more and more people are aware that the cultural relics are of great significance and join in protecting them.