石灰石矿的英文：
n. limestone mine

They are quarrying limestone.
他们在开采石灰石。

It has a rich and deep vein of limestone.
它有着储量丰富的深层石灰石矿脉。

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。

A magnesia - rich sedimentary rock resembling limestone.
白云灰岩一种似石炭岩，富含氧化镁的沉积岩

A siliceous rock of chalcedonic or opaline silica occurring in limestone.
硅石出现在灰岩中的玉髓或蛋白色硅石

This pen is mine.
这支笔是我的。

The left is mine.
左边的东西是我的。

This is an inactive mine.
这是一处闲置的矿井。

Change that cravat for this of mine, that coat for this of mine.
把你的蝴蝶结跟我的交换，上衣也跟我交换。

He is a good friend of mine.
他是我的一个好朋友。