Two pairs of panda twins reach one month old in Chongqing

Photo taken on July 23, 2019 shows a panda cub in an incubator at Chongqing Zoo, southwest China's Chongqing. Chongqing Zoo held an event Tuesday to celebrate two pairs of panda twins reaching one month old. Two giant pandas in the zoo in Chongqing gave birth to two pairs of twins on June 23. (Xinhua/Tang Yi)