production preparation of coal pits

[production preparation of coal pits]
[production preparation of coal pits]

中文释义

矿井生产准备

单词分析

单词结构:

production preparation of coal pits

字母数:35

记忆提示

🎯 重点记忆:

  • 单词拼写:production preparation of coal pits
  • 核心含义:矿井生产准备