It has seen the building of over 13,000 major and minor irrigation channels,some 5,200 large and small reservoirs able to hold more than 270 million cubic meters of water,and 18 river embankment projects,with a total length of about 250 km.是什么意思_It has seen the building of over 13,000 major and minor irrigation channels,some 5,200 large and small reservoirs able to hold more than 270 million cubic meters of water,and 18 river embankment projects,with a total length of about 250 km.在线翻译_英语_读音_用法_例句