Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu

Pro-democracy activist Agnes Chow releases from prison after serving nearly seven months for her role in an unauthorised assembly during the city's 2019 anti-government protests, in Hong Kong, China June 12, 2021. REUTERS/Tyrone Siu TPX IMAGES OF THE DAY

Vice-chairwoman of Hong Kong Alliance in Support of Patriotic Democratic Movements of China, Chow Hang-tung, speaks to the media before facing charges related to an illegal vigil assembly commemorating the 1989 Tiananmen Square crackdown last year, in Hong Kong, China June 11, 2021. REUTERS/Jessie Pang

A delivery worker of Chinese online grocery Dingdong Maicai works at a shop on a street in Shanghai, China June 10, 2021. REUTERS/Aly Song

A shop of MissFresh is seen at a street in Shanghai, China June 10, 2021. REUTERS/Aly Song

A delivery worker of Chinese online grocery Dingdong Maicai is seen on a street in Shanghai, China June 10, 2021. REUTERS/Aly Song

A shop of MissFresh is seen at a street in Shanghai, China June 10, 2021. REUTERS/Aly Song

A delivery worker of Chinese online grocery Dingdong Maicai works at a shop on a street in Shanghai, China June 10, 2021. REUTERS/Aly Song

Wan Lin, chief executive officer of Alibaba's logistics subsidiary Cainiao, speaks at the Global Smart Logistics Summit in Hangzhou, Zhejiang province, China June 10, 2021. REUTERS/Yilei Sun

Cheng Li, chief technology officer of Alibaba Group, speaks next to a Cainiao autonomous delivery robot at the Global Smart Logistics Summit organised by Alibaba's logistics arm Cainiao, in Hangzhou, Zhejiang province, China June 10, 2021. REUTERS/Yilei Sun

Daniel Zhang, chief executive officer of Alibaba Group, attends the Global Smart Logistics Summit organised by Alibaba's logistics arm Cainiao, in Hangzhou, Zhejiang province, China June 10, 2021. REUTERS/Yilei Sun

Humanoid robot Grace, developed by Hanson Robotics and designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, is seen at the company's lab in Hong Kong, China June 8, 2021. REUTERS/Joyce Zhou

Humanoid robot Grace, developed by Hanson Robotics, designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, has her lips painted at the company's lab in Hong Kong, China June 8, 2021. REUTERS/Joyce Zhou

Humanoid robot Grace, developed by Hanson Robotics and designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, is seen at the company's lab in Hong Kong, China June 8, 2021. Picture taken June 8. REUTERS/Joyce Zhou

An aerial view shows containers and ships at the Kwai Chung Container Terminal in Hong Kong, China June 7, 2021. Picture taken June 7, 2021 with a drone. REUTERS/Aleksander Solum

A mother walks with her twin daughters on a street in Shanghai, China June 7, 2021. REUTERS/Aly Song

People sit under tents as they wait to get their coronavirus disease (COVID-19) vaccination outside a shopping mall, in the Yangpu District of Shanghai, China June 7, 2021. REUTERS/Aly Song

Staff members sit at the entrance of a mall to check people for coronavirus disease (COVID-19) vaccination credentials in the Yangpu District of Shanghai, China June 7, 2021. REUTERS/Aly Song

Family members wait outside a high school as students take part in the annual national college entrance exam, or "gaokao”, in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student hugs her family member after an exam as part of the annual national college entrance exam, or "gaokao”, in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student walks towards her family member after an exam as part of the annual national college entrance exam, or "gaokao”, in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student leaves a high school with her parents after an exam as part of the annual national college entrance exam, or "gaokao”, in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

Teachers cheer for their students as they enter a high school to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student poses for a photo for her parent before entering the exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student hugs her friend before entering the exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang TPX IMAGES OF THE DAY

A parent interacts with her child before the start of the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

Parents react as the students walk to their exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

Students set up banners to cheer for the exam attendees taking part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A security guard is seen at an aisle for exam attendees to enter the high school to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student hugs her friend before entering the exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

People are seen outside a high school as students enter to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang REFILE - REMOVING EXTRANEOUS WORDS

A student walks toward the exam venue to take part in the annual national college entrance exam, or "gaokao", as students from the lower grades cheer him up, in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

Teachers cheer up their students as they enter the exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

A student hugs her friends as they enter the exam venue to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

An aerial view shows containers and ships at the Kwai Chung Container Terminal in Hong Kong, China June 6, 2021. Picture taken June 6, 2021 with a drone. REUTERS/Aleksander Solum

An aerial view shows containers at the Kwai Chung Container Terminal in Hong Kong, China June 6, 2021. Picture taken June 6, 2021 with a drone. REUTERS/Aleksander Solum

Teachers cheer for their students as they enter a high school to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

Security personnel check the students? exam admission tickets as they enter to take part in the annual national college entrance exam, or "gaokao", in Beijing, China June 7, 2021. REUTERS/Tingshu Wang

People look at police officers standing guard at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, June 4. REUTERS/Lam Yik

Police officers check the bag of a person at Causeway Bay on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers check the bag of a person at Causeway Bay on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers detain people at Causeway Bay on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

A painting on a wall marks the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

A police officer detains a man at Causeway Bay on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers disperse people mourning at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers stand at the entrance to Victoria Park to disperse people mourning at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

A general view of Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

A general view of Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

People light candles at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

People look at police officers standing guard at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers stop and search residents at Mong Kok district on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Pak Yiu

Police officers disperse people mourning at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

Police officers disperse people mourning at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

People look at police officers standing guard at Victoria Park on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik

People flash lights from their mobile phones, as they walk on the road outside Victoria Park after police officers dispersed them on the 32nd anniversary of the crackdown on pro-democracy demonstrators at Beijing's Tiananmen Square in 1989, in Hong Kong, China June 4, 2021. REUTERS/Lam Yik