universal service obligation

英 [universal service obligation]
美 [universal service obligation]

中文释义

普遍服务义务

单词分析

单词结构：

universal service obligation

字母数：28

记忆提示

🎯 重点记忆：

  • 单词拼写：universal service obligation
  • 核心含义：普遍服务义务

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更新时间：2026-03-20 06:39:15