短语词组短语mains water supply 自来水mains water connection 进水接口water mains 自来水总管道;自来水管Water Mains Replacement 换水管water mains detail 自来水干线Disinfecting Water Mains 消毒总水管fire water mains 消防主水管gas & water mains 煤气及供水的干管工程 返回 mains water