The combo photo taken on March 30, 2014 shows Chinese President Xi Jinping (3rd R, front), his wife Peng Liyuan (4th R, front), Belgian King Philippe (2nd R, front), Queen Mathilde (front R) and Belgian Prime Minister Elio Di Rupo (5th R, front) visiting the panda house at the Pairi Daiza zoo in Brugelette, Belgium. (Xinhua/Yao Dawei)

Chinese President Xi Jinping (3rd L, front), his wife Peng Liyuan (2nd L, front), Belgian King Philippe (2nd R, front) and Queen Mathilde (front R) unveil the panda house together at the Pairi Daiza zoo in Brugelette, Belgium, March 30, 2014. (Xinhua/Pang Xinglei)

 Chinese President Xi Jinping (R) and Belgian King Philippe shovel soil on a magnolia tree that symbolizes friendship at the Pairi Daiza zoo in Brugelette, Belgium, March 30, 2014. Xi and Belgian King Philippe attended the inauguration of a panda house at the zoo on Sunday. (Xinhua/Ma Zhancheng)

Chinese President Xi Jinping and his wife Peng Liyuan give a panda toy to a Belgian girl as gift at the Pairi Daiza zoo in Brugelette, Belgium, March 30, 2014. Xi and Belgian King Philippe attended the inauguration of a panda house at the zoo on Sunday. (Xinhua/Pang Xinglei)

Chinese President Xi Jinping (2nd R, front), his wife Peng Liyuan (front R), Belgian King Philippe (2nd L, front) and Queen Mathilde (L) pose for a photo in front of a magnolia tree that symbolizes friendship at the Pairi Daiza zoo in Brugelette, Belgium, March 30, 2014. Xi and Belgian King Philippe attended the inauguration of a panda house at the zoo on Sunday. (Xinhua/Ma Zhancheng)