protected coal seam

英 [protected coal seam]
美 [protected coal seam]

中文释义

被保护煤层

单词分析

单词结构：

protected coal seam

字母数：19

记忆提示

🎯 重点记忆：

  • 单词拼写：protected coal seam
  • 核心含义：被保护煤层

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更新时间：2025-12-22 07:25:54