ultra large coal

例句：

1. 1. The ultra-largecoal mine is located in the remote mountainous area.
   这个超大型煤矿位于偏远的山区。
2. 2. The company has invested heavily indeveloping ultra-large coal resources.
   该公司大力投资于开发超大型煤炭资源。
3. 3. Dueto the high cost of transportation, ultra-large coal is not widely used inindustrial applications.
   由于运输成本高昂，超大型煤炭在工业应用中并不广泛使用。