词汇	双管竖笛
释义	双管竖笛 double flageolet
随便看	energy saving principles energy-saving problem energy saving process energy-saving process energy-saving product energy saving products energy-saving products energy saving product structure energy-saving produet energy-saving project energy saving proper technology energy-saving pump energy saving quantity energy-saving range energy saving rate energy-saving rate aim energy saving ratio Energy-saving rebuilding technology energy saving reconstruct energysaving reconstruction energy saving reconstruction energy-saving reconstruction energy-saving reconstruction of external window energy saving reform energy-saving reform