1921年四月的天空

潮汐摩擦及其代價

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大眾科學 Magazine Vol 124 Issue 14This article was originally published with the title “The Heavens in April, 1921” in 大眾科學 Magazine Vol. 124 No. 14 (), p. 272
doi:10.1038/scientificamerican04021921-272
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