Photo 1：Tourists watch panda Jiao Qing in Berlin Zoo, June 9, 2018. Panda Meng Meng and Jiao Qing from China have become superstars of the zoo since they arrived on June 24 last year. [Photo/Xinhua]

Photo 2：A tourist takes photos of panda Jiao Qing in Berlin Zoo, June 9, 2018. [Photo/Xinhua]

Photo 3：Panda Meng Meng in Berlin Zoo, June 9, 2018. [Photo/Xinhua]