Their genetic profiles were compared to those from a large group of people who were not related, either as mothers or as family members, to dizygotic twins.
2
更让人注意的是,1870年前出生的双胞胎母亲的寿命比其他那些不怎么受到眷顾的母亲的更长。
Most strikingly, the pre-1870 group of mothers of twins actually lived longer than those who were not thus blessed.
The mothers of twins in the pre-1870 batch had 1.24 more children who survived past the age of 18 than did other mothers. After that date the figure was 1.56.