Invisible, Chinese vocabulary. Pinyin: wú xíng. Refers to the existence of things that people's eyes, ears and other sensory organs can't perceive. This kind of thing can be objective material, immaterial at the level of consciousness, or the concept of energy form.
Air, the environment in which people live is full of air, but normal air is colorless and tasteless, and people can't see air without special methods, so we can say that air is invisible, and air is an objective substance that actually exists.
Fear is a feeling in people's hearts. Microscopically speaking, some factors in the environment make people form this feeling of fear in their brains, such as watching horror movies, being afraid and afraid to sleep. People's feelings are actually a kind of stress response to the environment, and there is no real state, so we can also be called intangible.
Force, especially the mechanical force in physics. Force is a kind of existence and manifestation of energy. The simplest force is the gravity of the earth. Objects falling from the sky are caused by the vertical downward force of the center of the earth, but this force is also invisible, and we can't see it. Invisibility is a neutral word that does not directly contain positive or negative meanings.
Quote and explanation: On the Book of Rites: "Listening is silent and invisible." Kong Ying Da Shu: "What is invisible is to turn a blind eye to parents." Chapter 41 of Laozi: White is humiliating, generous without horns, a late bloomer, and an elephant is invisible. Tao is hidden and nameless. The husband is only good at Tao, good at borrowing and good at doing things.