石灰?guī)r常用于建筑.Limestone is often used in building construction.石灰?guī)r上有許多縫隙,故而樹(shù)根能從巖洞頂部長(zhǎng)出來(lái)。The limestone is sufficiently fissured for tree roots to have breached the roof of the cave.當(dāng)?shù)厥規(guī)r滲透性很強(qiáng)。The local limestone is very porous....