因为追踪邮件失败，这个水手被钉在了横杆（围栏）上。
The sailor was nailed on the rail for he failed to trail the mail.
通过追踪人们的电子邮件和在线帖子，科学家发现好消息比灾难和悲伤的故事传播得更快更远。
By tracking people's e-mails and online posts, scientists have found that good news can spread faster and farther than disasters and sob stories.
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.
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