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1920年2月14日

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河流和运河

政府正在采取哪些措施，以使这些水道的利用水平达到与湖泊相同的程度

作者：Robert G. Skerrett

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This article was originally published with the title “On River and Canal” in 大众科学 Magazine Vol. 122 No. 7 (February 1920), p. 158
doi:10.1038/scientificamerican02141920-158

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