Population Reference Bureau (PRB) 美国人口资料局
sea change 突变;突发性彻底转变;重大变化
put down to 归因于
tie the knot 结婚
put off 取消;撤销;推迟;延迟
economic distress 经济不景气
prevalent adj. 流行的;普遍的
go on 发生;延续下去
convention breaking 打破常规
Question time:
1. What's the main reason that married couples drops recently according to the report?
2. Why did Cleveland and New Orleans have the lowest proportion of young married couples according to the author?