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This used to be a coal mine, but it's abandoned now. 這兒曾經(jīng)是個(gè)礦井，但已經(jīng)被廢棄了。
Three years of research at an abandoned coal mine in Argonne, Illinois. 在伊利諾州市的一個(gè)廢棄煤礦的三年研究取得了成果。 8875.org
In the progress of tunnelling of track dip in No. 9 coal of Kangda mine at Xingtai, defective sectors such as abandoned old goaf are possible to be encountered. 邢臺(tái)康達(dá)煤礦9煤軌道下山掘進(jìn)過(guò)程中，可能會(huì)遇到廢棄老空區(qū)等不良地段，將面臨松散破碎圍巖條件下的支護(hù)難題。