As the researchers suspected, when all other things were equal mothers in monogamous marriages had most sons: 101 for every 100 daughters.

• 就如同研究人员猜测的一样，在其他条件相同的情况下，一夫一妻制的母亲育有更多儿子，平均每生出100个女儿，就会生出101个男孩。