短語詞組短語drainage e channel 排水溝;排水渠道;排水渠drainage dischatge channel 分流渠natural drainage -channel 自然排水溝drainage surface channel 排水明渠vertical drainage channel 竪曏排水通道irrigation -drainage channel 灌排渠道main drainage channel 主要集水區(qū)排水道;主排水渠drainage by open channel 明渠排水;明排水;集水麪積surface drainage channel 地表排水渠 返回 drainage channel