coal core sample

例句：

1. 1.The geologist collected a coal core sample from the mine to study its composition.
   地质学家从矿井中采集了一个煤芯样品，以研究其成分。
2. 2.The company used this coal core sample to analyze the mine's environmental impact.
   该公司使用这个煤芯样品来分析矿井的环境影响。
3. 3.The researcher analyzed the coal core sample to determine the mine's potential for future development.
   研究者分析了煤芯样品，以确定矿井未来开发的可能性。