Sound is produced by the vibration of objects, and it is also the source of the objects that emit sound. Sound travels in the form of sound waves Sound is just the movement of sound waves in solids, liquids or gases. Sound waves vibrate the ossicles of the inner ear, and these vibrations are converted into tiny electronic brain waves, which are the sounds we perceive. The inner ear uses the same principle as the sound waves captured by a microphone or the pronunciation of a speaker. Is the relationship between moving mechanical parts and air pressure waves. Naturally, when the acoustic Boeing is turned down and moved slowly and loudly enough, we can actually "feel" the air pressure wave vibrating the body. So we use mixed body parts to perceive sound.

1. refers to the impression produced by the sound waves generated by the vibration of an object through hearing.

"Rites and Music": "Music must start with sound, form with movement, and be the way to be human." Bao Zhao in the Southern Song Dynasty "Quasi"

2. Ancient times refers to music and poetry.

Rites and Music: "Sound is connected with politics." Jin Gehong's "Bao Puzi Xu Xue": "Sound can move the scale, and sincerity can feel the stone." Liu Tang Zongyuan Pei Fujun's Tomb: "Pei Gongle plays games and knows the sound." Gu Jielun's interpretation of national elegance in Ming Dynasty: "Lushan, Qin people are also good at Confucianism."

3. refers to the voice and accent.

Mencius Gao Zi Xia: "The sound of color is far away from people." Tang Yao sent the poem "Autumn Tour to Jiangdong": "Luqi tastes like the old, and the local songs are gradually different." Song Su Shi's Dongpo Zhi Lin Bian Yu: "There are many ladies-in-waiting concubines in the world, otherwise they will die soon after their illness, and their voices, faces and smiles will all die." "Awakening Marriage Biography, Cai Ruihong endured humiliation and revenge": "Ruihong is in the cabin, listening to the bow, it is the voice of Huai' an, like a thief Chen Xiaosi. "

4. Metaphorical views and arguments.

Mao Zedong's On Correctly Handling Contradictions among the People VIII: "This is because a party, like the same person, needs to hear different voices in its ears." Wei Wei's Collection of Heroes and Warriors with Happy Flowers: "Isn't this the voice of the idle class and literati?"