long flame bituminous coal

例句：

1. 1. The long flame bituminous coal is a popular choice for heating homes in cold weather.
   长焰煤是寒冷天气中家庭取暖的热门选择。
2. 2. Coal mining has been a major industry in this region for centuries.
   煤矿开采这个地区几个世纪以来一直是主要产业。
3. 3.The bituminous coal mines are located in the mountains of central China.
   这些煤矿位于中国中部山区。