n.石灰岩,石灰石;
例句:
Limestone had been carved away.
石灰石已被开采运走.
The mud is interrupted by numerous thin beds of limestone.
泥质物被许多薄层灰岩所隔开.
The answer is the same if the limestone overlays the sandstone.
当灰岩盖在砂岩上时,系数是相同的.