关于底砾层的成因问题，有多种观点。
There are many viewpoints about the genesis of the "bottom gravel".
受砾屑硅质岩、含砾砂屑硅质岩控制。
最简单的一种反应堆只不过是一堆石墨砾。
The simplest sort of reactor is no more than a pile of graphite bricks.
谁知道呢，你可能甚至会在乱石碎砾中找到钻石。
And who knows, you might even uncover a diamond in the rough.
与熔岩呈过渡的火山碎屑岩主要为角砾熔岩和集块熔岩。
The second rock is mainly breccia lava and conglomerate lava.
与熔岩呈过渡的火山碎屑岩主要为角砾熔岩和集块熔岩。
The second rock is mainly breccia lava and conglomerate lava.
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