old workings meaning in Chinese

老工作区

In the evening, barras and jennings went down and began to explore the old workings .
黄昏时分，巴勒斯和詹宁斯来到井下，开始仔细察看老矿区。
There was plenty of coal. the old workings could not get at it, that was all .
煤矿蕴藏相当丰富，但陈旧的作业面开采不到它，这便是问题的症结所在。
Research on recovery technology of remnant orebody with remained old workings
老窿残矿回收技术的研究
But it was in the deepest tunnels that grimgor found his real enemy and soon the old workings rang to the sounds of battle
格里姆格在地下巷道的最深处找到了它真正的敌手，战争的咆哮很快在这座古老的要塞中轰鸣起来。