There is no storage and translation function, only the simplest one. In different countries, students have different habits and hobbies for calculators. For example, American-made, TI's graphic calculator is very popular. This is mainly because TI-82 became one of the few models allowed to be used in the American education system in the 1990s, and most teaching materials were written with this calculator interface, so many schools collectively bought calculators of this model and subsequent models. Therefore, TI-8x series calculators are almost monopolized in the United States, and the price is also very high. For China students, the thin and portable Casio FX series is more popular, which is mainly related to the promotion of the education system. In addition, it also has practical function, natural writing and display function, and it is very convenient to read. The more common models are FX-82ES and FX-99 1ES.