Darkness, China's words, nouns and adjectives are antonyms of "light". Darkness can refer to a state of low illumination, such as a night without moonlight and starlight. Darkness can refer to a gloomy mental state, but it is not equal to evil. In the second dimension, dark representation includes revealing the cruelty and oppression of society.

The elements of bloody violence have the dark side of human nature, including obscure content and scary content. Darkness is not evil. Darkness is just a scapegoat for evil.

In literature, the opposition between darkness and light, if used to describe it, should refer to things that violate the most basic morality and values of human beings and show the cruelty and violence of society, uncivilized and irrational.

Science is an ordered knowledge system based on testable explanation and prediction of the form and organization of objective things, and it is systematic and formulaic knowledge. Its object is objective phenomenon, its content is formal scientific theory, and its form is language, including natural language and mathematical language.

Modern science is usually divided into three main branches: natural science (such as biology, chemistry and physics) that studies individuals and society, social science (such as economics, psychology and sociology) that studies abstract concepts, and formal science (such as logic, mathematics and computer science).

But whether formal science really constitutes a science is controversial, because they do not rely on empirical evidence. In addition, the discipline that uses existing scientific knowledge for practical purposes such as engineering and medicine is called applied science.