pillar working
Mining
noun
A working in which pillars are left in place.
Origin
Mid 19th century.
| 单词 | pillar working |
| 释义 | pillar workingMining noun A working in which pillars are left in place. Origin |
| 随便看 |
英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。