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It appeared, at first sight, to be a lightning conductor, mounted on insulator through the roof.
一眼看去, 它似乎是一根避雷针, 安装在穿过屋顶的绝缘体上.
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Probably, however, Franklin is most famous today for his inventions lightning conductor.
但今天最使他出名的或许是他的发明.
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