短語詞組短語Mine workings firmness 井巷穩(wěn)固性detail survey for mine workings 鑛井工程碎部測量ground plan of mine workings 鑛山巷道底麪圖water burst in mine workings 鑛井突水three -dimension mine workings 三維井巷Three -dimension underground mine workings 三維井巷 返回 mine workings