natural rock的用法和樣例：
例句
- Sawing with diamond abrasive tools is the most important method for the processing of natural stone.
使用金剛石工具的鋸切加工是切割天然岩石材料的最主要方式。 - This freeze-thaw cycle, a common form of erosion of natural rocks, too, weakens a structure directly and also exposes steel reinforcing rods to water, causing them to rust.
這種作為侵蝕天然岩石的常見形式的凍融循環，同樣會直接削弱建築物，並且還使鋼筋條與水接觸而導致他們生鏽。
