The Curriculum Standard for Senior High School Mathematics emphasizes that one of the specific goals of senior high school mathematics is to improve students' ability to ask, analyze and solve problems, to express and communicate mathematics, and to develop their ability to acquire mathematics knowledge independently. To truly understand, master and use them, students should be able to use three mathematical languages (written language, graphic language and symbolic language) flexibly, instead of just using one mathematical language. For example, the theorems in geometry are all expressed in written language, but the arguments to prove problems need to be expressed in symbolic language, and graphic language, as a supplement to written language and symbolic language, provides an intuitive model for mathematical thinking.