A staff member gives introduction near a picture of Chinese President Xi Jinping during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

A woman pushes a trolley with a child past exhibits showing the 2015 military parade marking the 70th anniversary of the end of World War Two presided by Chinese President Xi Jinping, at an exhibition on China's achievements ahead of the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

A woman walks with an umbrella past a picture of Chinese President Xi Jinping on a street in Shanghai, China September 25, 2019.

Chinese soldiers practice marching in formation ahead of military parade to celebrate the 70th anniversary of the founding of the People's Republic of China in Beijing, China September 25, 2019. Naohiko Hatta/Pool via REUTERS.

A girl poses for a photo as child performers wait backstage before a performance of the stage show "Yanan Nursery" in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee

People hold banners for group photos in front of a statue of late Chinese chairman Mao Zedong outside Yanan Revolutionary Memorial Museum in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee

Party members hold the Constitution of the Communist Party of China as they pose for a video outside the Yanan Revolutionary Memorial Hall in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee

Chinese flags hang outside windows of a building at a university ahead of the 70th founding anniversary of People's Republic of China in Shenyang, Liaoning province, China September 26, 2019. REUTERS/Stringer

Planes from the Chinese People's Liberation Army (PLA) air force fly during a rehearsal of the military parade on October 1 to mark the 70th anniversary of the founding of the People's Republic of China, in Beijing, China September 22, 2019.

Tourists are seen next to a statue of late Chinese chairman Mao Zedong outside Yanan Revolutionary Memorial Museum in Yanan, Shaanxi province, China, September 12, 2019. REUTERS/Jason Lee

Worker waters an installation an installation facing Chang'an Avenue ahead of the 70th anniversary of the founding of People's Republic of China on October 1, in Beijing, China September 23, 2019.

Visitors are seen in front of a picture of Chinese President Xi Jinping during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

Visitors are seen in front of exhibits showing the U.S. president Richard Nixon's 1972 visit to China, during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

Workers make Chinese flags at a factory ahead of the 70th founding anniversary of People's Republic of China, in Jiaxing, Zhejiang province, China September 25, 2019. REUTERS/Stringer

A member of Chinese military band performs at a camp during a tour arranged for media by the press centre in charge of celebrating the 70th anniversary of the country's founding, on the outskirts of Beijing, China September 25, 2019. Wang Zhao/Pool via REUTERS.

A bus carrying tourists passes a traffic ring island in Yanan, Shaanxi province, China, September 10, 2019. REUTERS/Jason Lee

Children dressed in replica uniforms of Red Army are seen at a revolutionary site in Yanan, Shaanxi province, China, June 27, 2019. REUTERS/Jason Lee

A woman stands amid Chinese national flags ahead of the 70th founding anniversary of People's Republic of China on October 1, in Beijing, China September 26, 2019.

A giant screen is set up at Tiananmen Square in preparation for the 70th founding anniversary of People's Republic of China on October 1, in Beijing, China September 26, 2019.

Couples attend a mass wedding at the city's municipal government building ahead of the 70th founding anniversary of People's Republic of China in Jiaxing, Zhejiang province, China September 22, 2019. REUTERS/Stringer

A man holding a Chinese national flag poses for a photo next to an installation facing Chang'an Avenue ahead of the 70th anniversary of the founding of People's Republic of China on October 1, in Beijing, China September 23, 2019.

Planes from the Chinese People's Liberation Army (PLA) air force fly during a rehearsal of the military parade on October 1 to mark the 70th anniversary of the founding of the People's Republic of China, in Beijing, China September 22, 2019.

Busts portraying late Chinese chairman Mao Zedong are dried under the sun outside a studio in Jingdezhen, Jiangxi province, China, June 24, 2019. REUTERS/Jason Lee

Visitors hold their mobile phones in front of exhibits showing People's Liberation Army (PLA) Navy's first aircraft carrier Liaoning, during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

Chinese firefighters get ready for a group photo with a Chinese flag outside an exhibition marking the 70th founding anniversary of People's Republic of China, in Kunming, Yunnan province, China September 25, 2019. REUTERS/Stringer

Workers make Chinese flags at a factory ahead of the 70th founding anniversary of People's Republic of China, in Jiaxing, Zhejiang province, China September 25, 2019. REUTERS/Stringer

A man walks past an exhibit showing China's first successful hydrogen bomb test in 1967, during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

A member of Chinese military band performs at a camp during a tour arranged for media by the press centre in charge of celebrating the 70th anniversary of the country's founding, on the outskirts of Beijing, China September 25, 2019. Wang Zhao/Pool via REUTERS.

Chinese troops take part in marching drills ahead of an October 1 military parade to celebrate the 70th anniversary of the founding of the People's Republic of China at a camp on the outskirts of Beijing, China September 25, 2019. Wang Zhao/Pool via REUTERS.

Portraits of late Chinese chairman Mao Zedong and military leader Zhu De are displayed at a revolutionary site in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee

Costumes and replica weapons are stored backstage before a performance of the stage show "Yanan Nursery" in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee

A performer dressed as a Kuomintang (KMT) soldier holds a replica weapon before taking part in "The Defense of Yanan" performance, a re-enactment of a famous battle performed daily for visitors, in Yanan, Shaanxi province, China, June 27, 2019. REUTERS/Jason Lee

A porcelain plate featuring the portrait of Chinese President Xi Jinping is seen at a ceramics market in Jingdezhen, Jiangxi province, China, June 23, 2019. REUTERS/Jason Lee

A man in a replica uniform of Eighth Route Army holds a red flag as he stands amid trees during "The Defense of Yanan" show, a re-enactment of a famous battle performed daily for visitors, in Yanan, Shaanxi province, China, June 27, 2019. REUTERS/Jason Lee

A resident cycles along a traditional alleyway, or hutong, with Chinese national flags to mark the 70th founding anniversary of People's Republic of China on October 1, in Beijing, China September 26, 2019.

Performers dressed as a Kuomintang (KMT) soldiers get ready before taking part in "The Defense of Yanan" performance, a re-enactment of a famous battle performed daily for visitors, in Yanan, Shaanxi province, China, June 27, 2019. REUTERS/Jason Lee

A worker sets up an installation featuring a giant basket of flowers at Tiananmen Square in preparation for the 70th founding anniversary of People's Republic of China on October 1, in Beijing, China September 26, 2019.

Buildings are lit by coloured lights to mark the upcoming 70th founding anniversary of People's Republic of China on October 1, in Beijing's central business area, China September 26, 2019.

A heart-shaped Chinese flag installation ahead of the 70th founding anniversary of People's Republic of China is seen on a street in Shanghai, China September 26, 2019.

Guides are seen during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

A visitor poses in front of pictures of late Chinese Chairman Mao Zedong, former Chinese leaders Deng Xiaoping, Jiang Zemin, Hu Jintao and Chinese President Xi Jinping during an exhibition on China's achievements marking the 70th anniversary of the founding of the People's Republic of China (PRC) at the Beijing Exhibition Center, in Beijing, China September 24, 2019.

China's national flags are seen on a screen ahead of Chinese national day in Hong Kong, China September 25, 2019.

Breeders hold Chinese flags and panda cubs born in 2019 as they pose for pictures during an event marking the upcoming 70th anniversary of the founding of the People's Republic of China at Chengdu Research Base of Giant Panda Breeding in Chengdu, Sichuan province, China September 24, 2019. China Daily via REUTERS

People pose for pictures in front of a flower installation ahead of the 70th anniversary of the founding of the People's Republic of China (PRC) at Beiling Park in Shenyang, Liaoning province, China September 24, 2019. REUTERS/Stringer

A revolutionary monument stands in a city square in downtown Yanan, Shaanxi province, China, June 25, 2019. REUTERS/Jason Lee

Performers take part in "The Defense of Yanan" show, a re-enactment of a famous battle performed daily for visitors, in Yanan, Shaanxi province, China, June 27, 2019. REUTERS/Jason Lee

Men dressed in replica uniforms of Eighth Route Army take a cigarette break outside Yanan Revolutionary Memorial Hall in Yanan in Yanan, Shaanxi province, China, June 26, 2019. REUTERS/Jason Lee