此外，创始者突变的单一拷贝通常赋予携带者生存优势。

Furthermore, the single copy of a founder mutation often confers a survival advantage on carriers.

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第二个优势是变更被集成(或提升)为一个单一、一致的整体。

A secondary advantage is that the changes are integrated (or promoted) as a single, consistent whole.

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15个使用单一货币（欧元）的国家提供了额外的实验优势。

The 15 EU nations that use the single currency—the euro area—offer an additional experimental advantage.

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