Coal is an important source of energy in many countries. （煤炭在许多国家都是重要的能源来源。）

The power plant burns coal to generate electricity. （发电厂燃烧煤炭来发电。）

Workers in the coal mine have to face difficult working conditions. （煤矿工人不得不面临艰苦的工作条件。）

Coal mining has a significant impact on the environment. （煤炭开采对环境有重大影响。）

We need to find ways to reduce our dependence on coal. （我们需要找到减少对煤炭依赖的方法。）

The price of coal has fluctuated in recent years. （近年来煤炭价格波动不定。）

Coal can be processed into various products. （煤炭可以加工成各种产品。）

Some old houses still use coal for heating in winter. （一些老房子冬天仍然用煤炭取暖。）

The coal industry is undergoing a transformation. （煤炭行业正在经历一场变革。）

Coal reserves vary from country to country. （各国的煤炭储量各不相同。）

They transported a large amount of coal by train. （他们用火车运输了大量煤炭。）

The coal seam is located deep underground. （煤层位于地下深处。）

Burning coal releases a lot of pollutants into the air. （燃烧煤炭会向空气中释放大量污染物。）

New technologies are being developed to clean coal. （正在开发新技术来清洁煤炭。）

Coal-fired boilers are gradually being phased out. （燃煤锅炉正逐渐被淘汰。）

The demand for coal has decreased in some regions. （一些地区对煤炭的需求已经下降。）

Miners risk their lives to extract coal from the mine. （矿工们冒着生命危险从矿井中开采煤炭。）

Coal gasification is an important process in coal utilization. （煤气化是煤炭利用中的一个重要过程。）

Scientists are researching more efficient ways to use coal. （科学家们正在研究更有效的煤炭使用方法。）

The coal yard is filled with piles of black coal. （煤场里堆满了黑色的煤炭。）