country rocks的用法和樣例：
例句
- Laminated siliceous rocks in country rocks might represent the nature of the Devonian hydrothermal sedimentary rocks.
圍岩中的層紋狀硅質岩可能代表了泥盆紀時期的熱水沉積岩性質。 - The dolomite of Upper Sinian Dengying Formation is favorable ore-source rock and useful ore-preserving country rock.
上震旦統燈影組碎裂狀白雲岩是有利的礦源層及有利的賦礦圍岩。
