石灰岩地形 shíhuīyándìxíng karst topography Origin Definitions Defs Strokes Stroke Words Sentences Sents 石灰岩 shíhuīyán limestone a type of sedimentary rock mainly composed of calcium carbonate, commonly known as 青石 qīngshí地形 dìxíng noun topography the physical features of the land, including surface shape, relief, and landforms like hills or basins