underground working的用法和樣例：
例句
- At last, the paper introduces the application method of wetting agents to suppress dust in underground mines.
最后介紹了濕潤劑在地下開(kāi)采礦山中的具體應用方法。 - The strata movement and the ground surface subsidence caused by underground mining are serious underground engineering problems.
地下開(kāi)采引起的巖層移動(dòng)和地表沉陷是一個(gè)非常嚴重的地下工程問(wèn)題。
