underground mining

短语词组

短語

• underground col mining 地下採煤
• underground coal mining 地下採煤
• underground E mining 地下開採
• Underground melting mining 地下熱熔開採
• underground d mining 地下採鑛
• underground coal mining method 地下採煤方法
• underground bench mining 井下梯段採鑛法
• underground trackless mining vehicle 地下無軌採鑛車輛
返回 underground mining