In the United States, before the pandemic, January 2020

This photo was taken in New York, in the USA,on February 8, 2020, before the COVID-19 outbreak.In the photo, we’re training for tomorrow’s team finals.

• The first one from the left is currently at New York University
• The second one from the left is currently at Tongji University, department of Energy and Power Engineering
• The third one from the left is currently at Nanjing University, department of chemistry
• The forth one from the left is me

It was the last time the all four of us saw each other, and after taking the last flight from the US to China, we never saw each other again until 2023.