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1.The engineer designed the building with a cupola bottom to provide natural lighting.
工程师设计了一座建筑，顶部有圆顶底部以提供自然照明。
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2. The construction of the new bridge required the installation of a cupola bottom.
新桥梁的建设需要安装一个圆顶底部。
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3. The architect was asked to design the cupola bottom for the dome roof.
建筑师被要求为穹顶屋顶设计圆顶底部。