Starting in 1983, more than 4, 500 volunteers were asked to fill out three questionnaires, spaced two years apart, about how many days in the previous week they had felt lonely.
自1983年起，每隔两年至少4500名志愿者填写答卷，回答上一周有几天感到孤单。
Starting in 1983, more than 4, 500 volunteers were asked to fill out three questionnaires, spaced two years apart, about how many days in the previous week they had felt lonely.
自1983年起，每隔两年至少4500名志愿者填写答卷，回答上一周有几天感到孤单。
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