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。
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.