three-grade system signal

英 [three-grade system signal]
美 [three-grade system signal]

中文释义

三级制信号

单词分析

单词结构：

three-grade system signal

字母数：25

记忆提示

🎯 重点记忆：

  • 单词拼写：three-grade system signal
  • 核心含义：三级制信号

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更新时间：2026-02-03 09:21:38