The "safety" of "food and clothing" is health preservation. Pinyin is Y and shí su ǒ ā n, which means clothes and food. & gt& ltBr's works were originally named Zuo's Spring and Autumn Annals, and later renamed Zuo Zhuan in Chunqiu Zuozhuan and Hanshu Zuozhuan, and were often called Zuo Zhuan after the Han Dynasty. It is one of the important Confucian classics, and it is also an important study history book for Confucian students in past dynasties. It is also called "Three Biographies of Spring and Autumn" with Biography of Ram and Biography of Gu Liang.