Recently, Hao Xuexi, a medical staff member of the Shandong Medical Aid Team in Shanghai, received a special letter, which made him particularly excited after a busy day in the makeshift hospital. The letter was sent by my father in my hometown in Liaocheng, Shandong. The five pages of letter paper were covered with my father's handwriting.

Hao Xuexi is a doctor at the Second Hospital of Shandong University and has extensive working experience in the front line of epidemic prevention. Recently, the situation of epidemic prevention and control in Shanghai is severe. He stepped forward and is...