Workers tie materials onto the back of a yak on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region, May 19, 2013. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers.(Xinhua/Chen Tianhu)

Xia Jianfeng (L) retreats to the base camp on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region, May 19, 2013. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers. (Xinhua/Suolang Luobu)

Xia Jianfeng (R) receives a hada, a white silk scarf symbolizing respect and blessing, from the captain of the climbing team on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region, May 19, 2013. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers.(Xinhua/Suolang Luobu)

Photo taken on May 19, 2013 shows the scenery on the Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers. (Xinhua/Chen Tianhu)

Xia Jianfeng (R) expresses his gratitude to the rescuers in the base camp on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region, May 19, 2013. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers. (Xinhua/Suolang Luobu)

Photo taken on May 19, 2013 shows Yaks conveying materials on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers.(Xinhua/Chen Tianhu)

Photo taken on May 19, 2013 shows Yaks conveying materials on Mount Qomolangma (Mount Everest), southwest China's Tibet Autonomous Region. Xia Jianfeng, a member of a commercial climbing team who suffered from cerebral edema on the altitude of 8, 650 meters, was rescued to the base camp on May 19. The successful rescue made a miracle as it took place in such high altitude of the mountain. As increasingly more people come to climb the world's highest mountain in recent years, the rescue system here is also rapidly improved for the safety of climbers.(Xinhua/Chen Tianhu)