workable coal seam

例句：

1. 1.The engineer analyzed the data to determine if the coal seam was workable for mining.
   工程师分析了数据，以确定煤层是否适合开采。
2. 2. The coal mine had a deep workable seam that could be mined for decades.
   煤矿有一个深的可工作煤层，可以开采几十年。
3. 3.The company is exploring new ways to exploit this workable seam of coal.
   该公司正在探索新方法来开采这种可工作的煤炭层。