在第一组中，双胞胎母亲超过18岁的子女的数量比其他母亲的多出1.24个，而这一数据在第二组中则为1.56.

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.

youdao

在第一组中，双胞胎母亲超过18岁的子女的数量比其他母亲的多出1.24个，而这一数据在第二组中则为1.56.

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.

youdao