An Old Photo from the Last Century

When Jiang Sheng'an, who lived alone in his later years, was sorting out old things, he found a worn old photo. He remembered the story of that person - his encounter and acquaintance with a foreign friend in the 1960s and 1970s. Jiang Shengan was on the train to Moscow, traveling with a young man from Yugoslavia. The two became connected because of the railway, and an emotion deep in their hearts that transcended friendship quietly developed. However, the turbulent current situation and the fate of their respective countries have forced each other to exchange letters for a long time... Purpose: This article would like to pay tribute to all those who have made silent contributions in their respective fields and witnessed the changes of the times.