Members of a Chinese honor guard wipe sweat off of their faces before a welcome ceremony for Palestinian President Mahmoud Abbas at the Great Hall of the People in Beijing, Tuesday, July 18, 2017. (Photo by Mark Schiefelbein/AP Photo)

This photo taken on August 5, 2017 shows visitors walking on stone piers crossing the Tuojiang River in the ancient town of Fenghuang in Xiangxi, in China' s central Hunan province. The old town district of Fenghuang nestles on the banks of a winding river in a picturesque, mountainous part of Hunan province, and boasts stunning Qing and Ming dynasty architecture dating back hundreds of years. (Photo by AFP Photo/Stringer)

A military band conductor rehearses ahead a ceremony to commemorate the 90th anniversary of the founding of the People's Liberation Army at the Great Hall of the People in Beijing, Tuesday, August 1, 2017. China's President Xi Jinping has issued a tough line on national sovereignty amid multiple disputes with his country’s neighbors, saying China will never permit any loss of territory. Xi’s declaration came during a nearly one-hour speech Tuesday in Beijing marking the 90th anniversary of the founding of the People’s Liberation Army. (Photo by Andy Wong/AP Photo)

A man wears a facekini mask in a seaside resort in Qingdao, China on July 22, 2017. (Photo by Reuters/China Stringer Network)

Train attendants take part in a parade training as they visit the national flag guard during a patriotic education event ahead of the 90th anniversary of the founding of the Chinese People's Liberation Army (PLA) in Beijing, China July 25, 2017. (Photo by Reuters/China Stringer Network)

Wang Zenan, the leading actor in “Jinsha River”, performs on the stage of the National Centre for the Performing Arts during opera's final dress rehearsal in Beijing, China July 27, 2017. “Jinsha River”, the opera adapted from a novel of the same name telling the story of the Red Army on the long march in Tibetan area in 1935, will have its premiere as the country marks the 90th anniversary of the founding of Chinese People's Liberation Army (PLA). (Photo by Damir Sagolj/Reuters)

A man tries Virtual Reality (VR) games at the China Digital Entertainment Expo and Conference (ChinaJoy) in Shanghai, China July 27, 2017. (Photo by Aly Song/Reuters)

Military soldiers and officers attend an opening ceremony of Memorial of the August 1 Nanchang Uprising after a renovation ahead of the 90th anniversary of the founding of the People's Liberation Army (PLA) in Nanchang, Jiangxi province, China July 28, 2017. (Photo by Reuters/China Stringer Network)

Tourists get on and off tour buses outside a hotel in Hong Kong, China July 30, 2017. (Photo by Bobby Yip/Reuters)

People play mahjong as they sit in water at a water park on a hot day in Chongqing, China August 2, 2017. (Photo by Reuters/China Stringer Network)

Fireworks explode over Juzi Island to mark the 90th anniversary of the founding of the China's People's Liberation Army in Changsha, Hunan province, China on August 2, 2017. (Photo by Reuters/China Stringer Network)

Yi ethnic minority girls wait to participate in a traditional performance to celebrate the Torch Festival in Butuo County, Sichuan province, China July 18, 2017. Picture taken July 18, 2017. (Photo by Natalie Thomas/Reuters)

People cool off at a water park on a hot day in Luzhou, Sichuan province, China, August 5, 2017. (Photo by Reuters/China Stringer Network)

Chinese visitors take selfies with their mobile phones on selfie sticks at the entrance of Gubeishui town at the bottom of the Simatai Great Wall in Miyun county, 120 kilometers northeast of Beijing, China, 23 July 2017. (Photo by How Hwee Young/EPA/EFE)

People visit a section of the Simatai Great Wall in Miyun county, 120 kilometers northeast of Beijing, China, 23 July 2017. Built during the Northern Qi dynasty (550-577) and rebuilt during the Ming dynasty, the Simatai Great Wall is 5.4 km long with 35 beacon towers and feature some of the less known parts of the Great Wall. It was closed in 2010 but has since opened to tourists in 2014. China's Great Wall was designated by UNESCO as a World Cultural Heritage site in 1987. (Photo by How Hwee Young/EPA/EFE)

Chinese tourists with swim rings enjoy swimming in the lake called “Dead sea of China” in a resort of Suining city, southwestern China's Sichuan province, 22 July 2017. More than 8,000 tourists gathered enjoy the water during hot weather. (Photo by Lola Levan/EPA/EFE)

Chinese tourists with swim rings enjoy swimming in the lake called 'Dead sea of China' in a resort of Suining city, southwestern China's Sichuan province, 22 July 2017. More than 8,000 tourists gathered enjoy the water during hot weather. (Photo by Lola Levan/EPA)

A child wears a pair of shoes embroidered with the map of China in the color of the national flag and the slogan “Those who invade my territory will be punished no matter how far away” as he lines up to visit an exhibition to mark the 90th anniversary of the founding of the People's Liberation Army at the military museum in Beijing, China, Tuesday, August 1, 2017. Chinese President Xi Jinping issued a tough line on national sovereignty Tuesday amid multiple territorial disputes with his country's neighbors, saying China will never permit the loss of “any piece” of its land to outsiders. (Photo by Ng Han Guan/AP Photo)

Two men practice martial arts techniques at a public park in Beijing, Wednesday, July 26, 2017. Beijing is dotted with urban parks that offer a quieter, greener respite from the crowded streets of China's capital. (Photo by Mark Schiefelbein/AP Photo)