随着工业化横扫世界而诞生的发达国家中, 生育率急剧下降, 这种现象首先发生在法国, 然后是英国, 后来遍及整个欧洲和美洲.当人们富裕时, 家庭规模变小;
As industrialisation swept through what is now the developed world, fertility fell sharply, first in France, then in Britain, then throughout Europe and America.
第一，家庭规模比以前变小了。
哥伦布的俄亥俄州立大学的社会学家堂娜。博比特- Zeher称：“人们的家庭规模在变小，更多的孩子在几乎没有兄弟姐妹陪伴的环境下长大。”
"People are having smaller families and more children are growing up with fewer siblings," said Donna Bobbitt-Zeher, a sociologist at Ohio State University in Columbus.
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