underlying rock

• 下伏岩石,母岩,底岩,下垫岩石

underlying rock的用法和样例：

例句

1. The mother rock derived form Archaean and Early Proterozoic metamorphic rock from the north-east part of Ordos Basin.
   该区延长组母岩主要来自盆地东北缘的太古代及早元古代变质岩。
2. Once formed, zircon crystals are so durable that they can persist even if their parent rock is exposed at the surface and destroyed by weathering and erosion.
   但是，这些锆石所蕴含的讯息似乎隐晦不清，部份原因是地质学家无法确定它们的母岩。