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1917年4月7日

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1917年四月的天象

星光和人眼的灵敏度

作者：Henry Norris Russell

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This article was originally published with the title “The Heavens in April, 1917” in 大众科学 Magazine Vol. 116 No. 14 (April 1917), p. 347
doi:10.1038/scientificamerican04071917-347

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