短語詞組短語Bottom Plate Cleaning 底板清洗bottom surface cleaning technology 下表麪清理技術tunnel bottom cleaning 臥底;巷道臥底bottom -hole cleaning 井底清洗;淨化井底bottom cleaning plug 底部清除塞bottom cleaning machine 臥底機reservoir bottom cleaning 庫底清理cleaning bottom of hole 掃孔CLEANING BOTTOM BIT 清底刀 返回 bottom cleaning