A working staff member takes care of giant panda twins Da Shuang and Xiao Shuang at the zoo of southwest China's Chongqing Municipality, Aug. 11, 2016. Giant panda twins Da Shuang and Xiao Shuang, who were born on July 11, made their debut at the zoo Thursday. (Xinhua/Tang Yi)

Photo taken on Aug. 11, 2016 shows giant panda twins Da Shuang and Xiao Shuang at the zoo of southwest China's Chongqing Municipality. Giant panda twins Da Shuang and Xiao Shuang, who were born on July 11, made their debut at the zoo Thursday. (Xinhua/Tang Yi)