To learn whether they also had an effect on their sisters' reproductive success, researchers investigated 197 women and 76 men. They ranged in age from 18 to 75, and all but 10 - seven of them women - had siblings.

為了了解兄弟的存在是否會影響女孩子的生殖情況，研究人員調(diào)查訪問了197位女性和76位男性。他們年齡在18歲到75歲之間，除了10人沒有兄弟姐妹外（10人中有7位是女性），其他人都不是獨(dú)生子女。

"This research helps us to better understand how family dynamics influence development," said researcher Fritha Milne, a behavioral ecologist at the University of Western Australia.

“該項(xiàng)研究有助于我們更好地理解家庭動態(tài)如何影響生殖發(fā)育，”西澳大學(xué)行為生態(tài)學(xué)家弗利沙-米爾恩說道。