Accelerate the development of external resources, access to more than 50 billion tons of coal reserves;

加快外部资源开发，获得了50多亿吨的煤炭储量；

youdao

Accelerate the development of external resources, access to more than 50 billion tons of coal reserves;

加快外部资源开发，获得了50多亿吨的煤炭储量；

youdao