What does safety mean?

Xixi's explanation refers to Shuiji. Qing Li-Hubei's "Winter Visit to the Cave" No.3: "The stream sings its own medicine, and the wind keeps learning to play the flute." See Water Pheasant. Interpretation of word decomposition stream: stream is the same as the root of "stream": description of rice milling equipment made of wood and stone in valley: rice milling workshop. Radical: stone.