Fluid intelligence refers to people's ability to learn new things without relying on cultural and knowledge background, and to give treatment related to basic psychological processes. Influenced by congenital genetic factors, it will decline with age, such as attention, knowledge integration and quick thinking.
Crystal intelligence means that the acquired ability of future generations is related to the accumulation of cultural knowledge and experience, and does not decline with age, such as the breadth of knowledge, common sense of judgment and so on.
From the time point of view, liquid intelligence will gradually decline with the increase of age after the maturity of human beings reaches its peak, while crystal intelligence will not decline, but will rise in adulthood.
The enlightenment to education is to develop students' abilities and expand their crystal intelligence through education.