mining under pillar

• 煤柱下开采

mining under pillar的用法和样例：

例句

1. According to the creep mechanics test parameters, we have constructed a nonlinear creep formula, which provides a theory basis for roadway support in coal mining under the sea.
   根据含油泥岩蠕变力学参数，推导出横向各向异性非线性蠕变方程，为海下开采条件下的巷道支护提供了理论依据。