Two pairs of panda twins reach one month old in Chongqing

A tourist takes a picture of a pair of panda cubs in an incubator at Chongqing Zoo, southwest China's Chongqing, July 23, 2019. 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)