tunnel and ore pass development

[tunnel and ore pass development]
[tunnel and ore pass development]

中文释义

平硐溜井开拓

单词分析

单词结构:

tunnel and ore pass development

字母数:31

记忆提示

🎯 重点记忆:

  • 单词拼写:tunnel and ore pass development
  • 核心含义:平硐溜井开拓