on-hook signal

英 [on-hook signal]
美 [on-hook signal]

中文释义

挂机信号

单词分析

单词结构：

on-hook signal

字母数：14

记忆提示

🎯 重点记忆：

  • 单词拼写：on-hook signal
  • 核心含义：挂机信号

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更新时间：2026-02-01 18:45:04