• 1. 三字母词: trigraph | trigraph sequences
• 2. 三字母单词: three-letters words
• 3. 三个字母缩略词: three letter acronym

• 1.RSS聚合是最常见的TLA(三字母缩写词)之一。
  RSS syndication is one of the most common TLAs around (TLA stands for Three Letter Acronym).
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