1. 1937年，日军的侵略给中国三所著名大学带来了灾难： 北京大学、清华大学被日本军队占领，南开大学被彻底炸毁。

In 1937, the aggression of the Japanese army brought disaster to China's three great universities： Peking University and Tsinghua University were occupied by Japanese troops, by bombing.