曾几何时，独自生活的人往往是婚姻中的任意一方——或是包括20多岁的专业人士，或是丧偶的老年人。
Once upon a time, people who lived alone tended to be those on either side of marriage—twentysomething professionals or widowed senior citizens.
然而，这些研究中的大部分没有将分居、离婚、丧偶的人和从未结过婚的人区分开来。
Most of these studies, however, haven't distinguished between people who are separated, divorced or widowed and those who have never been married.
本研究还另外发现，不管男性和女性，没结过婚的人明显没有离婚或丧偶的人大方。
The study also found that people, both males and females, who had never been married were significantly less generous than people who were divorced or widowed.
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