kuàng gōng men huī wǔ zhe hè zuǐ gǎo，zài shān dòng lǐ jiān nán de záo kāi jiān yìng de yán céng。

矿工们挥舞着鹤嘴镐，在山洞里艰难地凿开坚硬的岩层。

Miners wielded pickaxes, laboriously breaking through hard rock layers inside the cave.