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1. The ancient city is famous for its unique bluestone architecture.
这个古城以其独特的蓝石建筑而闻名。
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2. The museum exhibits a collection of ancient bluestone artifacts.
博物馆展示了一批古老的蓝石文物。
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3. The bluestone in the park was once used to build the city walls.
公园里的蓝石曾经被用来建造城墙。