A flag-raising ceremony is held during a grand gathering celebrating the Communist Party of China (CPC) centenary at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

The national flag guards stand in formation during a flag-raising ceremony at a grand gathering celebrating the centenary of the Communist Party of China (CPC) at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Military aircraft fly over Tian'anmen Square in echelons ahead of a grand gathering celebrating the Communist Party of China (CPC) centenary in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Military aircraft fly in echelon ahead of a grand gathering celebrating the Communist Party of China (CPC) centenary in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Military aircraft fly in echelon ahead of a grand gathering celebrating the Communist Party of China (CPC) centenary in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Military aircraft fly in echelons ahead of a grand gathering celebrating the Communist Party of China (CPC) centenary in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A national flag-raising ceremony is held at Tian'anmen Square during a ceremony marking the centenary of the Communist Party of China (CPC) in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A gun salute is fired during a ceremony marking the centenary of the Communist Party of China (CPC) at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

The national flag guards march during a flag-raising ceremony at a grand gathering celebrating the centenary of the Communist Party of China (CPC) at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Doves are released to the sky at Tian'anmen Square in Beijing, capital of China, July 1, 2021. A ceremony marking the centenary of the Communist Party of China (CPC) was held at Tian'anmen Square in Beijing on the morning of July 1. [Photo/Xinhua]

Balloons are released during a ceremony marking the centenary of the Communist Party of China (CPC) at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

A ceremony marking the centenary of the Communist Party of China (CPC) is held at Tian'anmen Square in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]

Military aircraft fly in echelons ahead of a grand gathering celebrating the Communist Party of China (CPC) centenary in Beijing, capital of China, July 1, 2021. [Photo/Xinhua]