Visitors take photos at the Beijing Aquarium in Beijing, capital of China, on July 25, 2020. The Beijing Aquarium reopened on July 24 after it was temporarily shut on June 20 following a COVID-19 outbreakat the Xinfadi wholesale food market. (ZOU HONG / CHINA DAILY)

Visitors watch a performance at the Beijing Aquarium in Beijing, capital of China, July 25, 2020. (ZOU HONG / CHINA DAILY)

Visitors look at penguins at the Beijing Aquarium in Beijing, capital of China, July 25. (ZOU HONG / CHINA DAILY)

Visitors look at sharks swimming at the Beijing Aquarium in Beijing, capital of China, July 25, 2020. (ZOU HONG / CHINA DAILY)

Penguins walk at the Beijing Aquarium in Beijing, capital of China, July 25, 2020. (ZOU HONG / CHINA DAILY)