《技术评论》杂志解释称：单个字母的单词有1个字尾，两个字母的单词有2个字尾，以此类推。
Tech Review explains: There are 1-grams for one-letter words, 2-grams for two-letter words and so on.
大多数VoiceXML系统无法区分单词和单一字母，而且某些系统会拒绝接受少于两个字符的单词。
Most VoiceXML systems are unable to identify the distinction between the word and the single letter, and some will simply refuse to accept words with less than two characters.
每一个由国防部大型作战行动命名设备决定的作战代号名称，都是由两个字母构成一个字母群再使其组成“两个单词构成的系列代号”。
Each command within the vast Defense Department apparatus is given a series of two-letter groupings that they can use for their operations’ two-word sobriquets.
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