确定年代变得更容易了

地质年代学家调和两种时间尺度

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大众科学 Magazine Vol 272 Issue 2This article was originally published with the title “It's Getting Easier to Find a Date” in 大众科学 Magazine Vol. 272 No. 2 (), p. 18
doi:10.1038/scientificamerican0295-18a
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