Hot air balloons fly over the city of Luxor, Egypt, on Sept. 10, 2017. (Xinhua/Ahmed Gomaa)
China, Pakistan air forces hold joint training exercises
Pic story: Chinese grape and wine expert
Farmers busy with farm work around Bailu across China
Rural children take free lunch in SW China's Guizhou
In pics: China's future Mars simulation base in Qinghai
Actors perform during acrobatics show in central China's Puyang
Colorful houses seen in N China's beautiful countryside
Spectacular scenery of Hukou Waterfall of Yellow River