煤炭

煤炭

Coal.

Here, '煤炭' refers to coal as a general concept of a resource in discussing energy sources.

煤炭是重要的能源资源之一。

Coal is one of the important energy resources.

In this sentence, '煤炭' is mentioned as a specific material or fuel used in industrial processes.

许多工厂使用煤炭作为主要燃料。

Many factories use coal as the main fuel.

Here, '煤炭' is used in the context of its utilization and its subsequent environmental implications.

煤炭的使用对环境产生了很大的影响。

The use of coal has had a significant environmental impact.