年龄从19到83岁的**被要求完成问卷调查，问卷的内容是社会交往的频率大小以及社会交往涉及到多少不同的圈子。
Volunteers aged between 19 to 83 were asked to complete questionnaires which measured how many regular social contacts they had, and in how many different groups.
年龄从19到83岁的**被要求完成问卷调查，问卷的内容是社会交往的频率大小以及社会交往涉及到多少不同的圈子。
Volunteers aged between 19 to 83 were asked to complete questionnaires which measured how many regular social contacts they had, and in how many different groups.
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