短語詞組短語drain oil line 排油管case drain oil line 箱體排油管路pump drain oil line 泵的排油管路main drain feed line 主給水管路freewheel valve drain line 自由輪閥泄油管oil drain line 排油管路;疏油管線case drain line 箱體排油管路polymer drain line 聚合物凝液的管道snorkel mast drain line 圍阱泄水管路 返回 drain line