Photo taken on Aug. 14, 2019 shows panda Meng Meng at the Zoo Berlin in Berlin, capital of Germany. Zoo Berlin is getting ready to welcome one or two newborn panda cubs as experts say it's very likely that the 6-year-old panda Meng Meng is pregnant. (Xinhua/Shan Yuqi)

Thomas Hildebrandt, head of the reproduction management department at Germany's Leibniz Institute for Zoo and Wildlife Research, points the position of the embryo during a press conference at the Zoo Berlin in Berlin, capital of Germany, on Aug. 14, 2019. Zoo Berlin is getting ready to welcome one or two newborn panda cubs as experts say it's very likely that the 6-year-old panda Meng Meng is pregnant. (Xinhua/Shan Yuqi)