recoverable pillar
recoverable pillar
[矿业英汉词典]
recoverable pillar可回收的煤柱
是什么意思，recoverable pillar的解释，recoverable pillar的翻译
[环境英汉词典] recoverable pillar
recoverable pillar
[矿业英汉词典]
recoverable pillar是什么意思，recoverable pillar的解释，recoverable pillar的翻译
[环境英汉词典] recoverable pillar