Now all major TV stations are broadcasting secrets, explorations, files, comments and so on. As a hot file, this will definitely help us fill the gaps and enrich our after-school knowledge. However, from primary school to high school, it is not taught as a major subject, but there is no continuity in itself, and each history is just an independent paragraph. Unlike mathematics and Chinese, which need to be accumulated from small to large, simple examples, if addition and subtraction can't, multiplication and division will be gone. Of course, if you are interested, you can study liberal arts in high school and study further after going to college!