Across the river, the following decade, Gustave Eiffel began work on his monumental iron tower as an emblem of industry and science.
在接下来的十年里，古斯塔夫·埃菲尔开始在河对岸建造他的不朽的铁塔，作为工业和科学的象征。
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The question perplexed people for years, until, in the 1950s, a German scientist named Gustave Kramer provided some answers and, in the process, raised new questions.