To recover the remainder coal in the side slope walls of surface mine by use of underground coal winning method can increase coal recovery rate and mine economic effect.

采用地下台阶式开采法回采露天矿端帮煤可大大提高煤炭资源回收率和矿山经济效益；

youdao

For a long time he involved in tunnel & underground work management and technical research, by winning many times prizes of national and provincial levels, with many papers published.

长期从事隧道及地下工程管理和技术研究工作，荣获国家、省部级奖项多次，发表论文及论著多篇。

youdao

And the Tories' last-minute plan to privatise London Underground, far from winning over supporters, may have lost some.

ECONOMIST: The campaign in London