2. Douchi is a kind of bean food. Generally, it is cooked with soybeans or black beans and fermented, which is mostly used for seasoning.

3. The basic meaning of "bean" is an ancient vessel for holding food, such as bean bowl and bean bowl; The extended meaning is something shaped like a bean, such as a potato; An ancient vessel for holding meat or other food, shaped like a high-legged dish, such as a bean. In modern Chinese, the word "bean" also represents the ancient unit of weight, such as sixteen millet for one bean and six beans for one baht.

4. "Chi", a standard secondary character in modern Chinese, is pronounced as chǐ in Putonghua, which was first seen in the era of Xiao Zhuan in Qin Dynasty and belongs to pictophonetic characters in Liushu. The basic meaning of "black bean" is a kind of food made from cooked soybeans or black beans after fermentation.