在实际的融合过程中，由两个物种的遗传物质在概念上是可交融的，染色体的一半来自父母一方，一半来自另一方。

In a true hybrid, the genetic material from the two species is mingled at conception, with half the chromosomes coming from one parent and half from the other.

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研究负责人、爱丁堡大学的蒂姆·贝茨说：“我们发现，研究对象在快乐方面的差异约有一半受到遗传基因的影响。”

"We found that around half the differences in happiness were genetic," said Tim Bates, a researcher at the University of Edinburgh who led the study.

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这块蛋糕的一半就是遗传设定好的那一半，而最小的那一片蛋糕表示的是环境因素，说明人们幸福感的差别有10%是由环境决定的。

Half the pie is the genetic set point. The smallest slice is circumstances, which explain only about 10 percent of people's differences in happiness.

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