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1928年7月1日

1分鐘閱讀

巨大的鐵路填方工程

最初的木製棧橋被取代，先是鋼橋，然後是大型土方填築

作者：J. 伯納德·沃克

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More by J. Bernard Walker

This article was originally published with the title “A Mammoth Railroad Fill” in 大眾科學 Magazine Vol. 139 No. 1 (July 1928), p. 20
doi:10.1038/scientificamerican0728-20

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