简称共祖近度 relative recency of common ancestor
·2,447,543篇论文数据，部分数据来源于NoteExpress
从区域来看，长江棉区的陆地棉品种间平均共祖度最高，达0.4407；
The average value for upland cotton varieties in CCR exhibited the highest, amounting to 0.4407;
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