main irrigation channel

基本解釋

Drawing off water from its main channel as for irrigation.
把水從主要河道放出來例如為了灌溉。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel from Datong river to water irrigation project at Qinwangchuan region.
盤道嶺隧洞是引大入秦灌溉工程總干渠上最長的無壓引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel of theDatong River to Qinwangchuan region water transferring irrigation project.
盤道嶺隧洞是甘肅引大入秦灌溉工程總干渠上最長的無壓引水隧洞。