技术手段包括信件、电报、联络站等。
The technical means of the liaison mechanism included letters, telegrams, focal points, etc.
最重要的物品包括信件、帐簿、回忆录和地图，它们背后都大有故事可说。
The most important objects are the letters, ledgers, memoirs and maps. And they have quite a tale to tell.
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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