地质上的时间单位Ma

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Ma (millium annum)
Abbreviated Ma, without periods; literally million years before present. The capital "M" conforms with SI nomenclature for the prefix Mega-, meaning million. This abbreviation can also be read "Mega annum", mixing the SI prefix with Latin.
参考资料:http://chi.proz.com/kudoz/1941818

回答者: xNarcissus

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