However, it is expected that the genetic homogenisation of the European populations during the last two millennia complicates our ability to discern subtle
changes
in ancestry by using some common population genetic tools
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每次脑子第一反应就是变化,细微的变化?看不懂,但细微的差异——一眼就懂了。
“changes”在这里应该指多个比对对象之间的区别。