coal-forming process

例句：

1. 1. The coal-forming process is essential for the development of a region's economy.
   煤成过程对于地区经济的发展至关重要。
2. 2. The coal-forming process involves the transformation of organic matter into coal.
   煤成过程涉及有机物质转化为煤炭的过程。
3. 3.The coal-forming process is complex and requires careful monitoring to prevent environmental damage.
   煤成过程复杂，需要仔细监测以防止环境损害。