将放射性物质放入钻孔中然后测量放射线穿过周围岩石的特性，可以提供地下物质的更详细信息。
Lowering radioactive material into a borehole and measuring how well the radiation passes through the surrounding rock provides more information about what's down there.
将放射性物质放入钻孔中然后测量放射线穿过周围岩石的特性，可以提供地下物质的更详细信息。
Lowering radioactive material into a borehole and measuring how well the radiation passes through the surrounding rock provides more information about what's down there.
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