The isotopic signatures of most ancient limestones indicated the same process.大多数古代石灰岩的同位素特征说明了同样的过程.There are four principal types of limestones.石灰岩有四种主要类型.Soil: Altitude 260 meters, southeast orientation . Limestone gr...

n.石灰岩( limestone的名词复数 )...

limestones的音标：...