Studies that tried to track how chain letters propagate by email suffered from selection bias because they included only posts that had been "fossilized" on newsgroup archives.
那些试图追踪通过邮件传播的连锁信件受到选择性偏差的干扰，因为他们只包括了那些新闻组档案里过时的帖子。
Studies that tried to track how chain letters propagate by email suffered from selection bias because they included only posts that had been "fossilized" on newsgroup archives.
那些试图追踪通过邮件传播的连锁信件受到选择性偏差的干扰，因为他们只包括了那些新闻组档案里过时的帖子。
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