The sky is bright summer on the banks of the Red River

The author has something to say: ①Plant ash: the residue after burning plants (herbs and woody plants), called plant ash.Plant ash is light and alkaline, and it is widely used as a raw material for disinfectants in rural areas. It has a strong effect of killing pathogenic bacteria and viruses, and its effect is similar to that of commonly used powerful disinfectant caustic soda.

② Senecio grass, fresh coriander root: two kinds of Chinese herbal medicines that are beneficial to people who are sick.