three unders in coal mining

英 [three unders in coal mining]
美 [three unders in coal mining]

中文释义

三下采煤

单词分析

单词结构：

three unders in coal mining

字母数：27

记忆提示

🎯 重点记忆：

  • 单词拼写：three unders in coal mining
  • 核心含义：三下采煤

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更新时间：2026-01-31 02:05:45