n.石灰石，石灰岩

原形：limestone复数：limestones

Limestone is primarily composed of calcium carbonate, CaCO3. (石灰石主要由碳酸钙组成。
The ancient Roman buildings were constructed from durable limestone blocks.
古罗马建筑使用了坚固的石灰石块。
The landscape around here is characterized by extensive limestone formations.
这一带的地形以广阔的石灰岩地貌为特色。
Limestone caves, such as those in Mammoth Cave National Park, are popular tourist attractions.
像猛犸洞国家公园那样的石灰岩洞穴是热门旅游景点。
Architects often use limestone for its aesthetic appeal and ease of carving.
建筑师常选用石灰石，因其美观且易于雕刻。
Limestone can be quarried and used as a raw material for cement production.
石灰石可以开采用于制造水泥。
The farmer smoothed the limestone path leading to his farmhouse.
农夫平整了通向农舍的石灰石小径。
Fossilized shells embedded in limestone indicate past marine life.
嵌在石灰石中的化石贝壳揭示了过去的海洋生物。
Limestone is vulnerable to erosion by acidic rain, which weakens its structure.
石灰石易受酸雨侵蚀，会削弱其结构。
A limestone fireplace adds a classic touch to any living room.
石灰石壁炉为任何客厅增添了一种经典风格。