"New things refer to things that conform to the law of development, have strong vitality and great prospects." This sentence refers to the new things that are different from the old things in the development of human society. These things usually have strong vitality and great prospects.

With the development of society and science and technology, new things appear constantly. They are innovative, unique and advanced. These new things can meet people's changing needs and promote social and economic development.

For example, with the continuous development of Internet technology, many new e-commerce platforms and social media platforms have emerged, which have changed people's lifestyles and work styles and become an indispensable part of modern society.

New things also have great vitality and great prospects. They can adapt to the changes of society and market, innovate and improve constantly, and improve their competitiveness and market share. For example, electric cars are new things in recent years. With the continuous improvement of environmental awareness and technological progress, the market share of electric vehicles has been expanding, which has become one of the development directions of the future automobile industry.

However, the emergence of new things does not mean that the old things are unnecessary. Old things also have their rationality and value in a certain historical period. Therefore, the relationship between new things and old things is not a simple substitute, but interdependent and mutually reinforcing.

For example, traditional cultural customs and values still exist and are passed down in some areas, which is of great significance to the spiritual life and cultural identity of local people.

In short, the phrase "new things are things that conform to the development law of things and have great vitality and great prospects" means that new things are innovative, unique and advanced, can adapt to the changes of society and market, constantly innovate and improve, and improve their competitiveness and market share. At the same time, the relationship between new things and old things is not a simple substitute, but interdependent and mutually reinforcing.