Onion download course is in the memory card installed in Onion Mathematics, Android/data/com.yangcong345.android.phone/files/download. Onion College (formerly Onion Mathematics) was established at the end of 20 13 [54]. It was founded by Yang, who graduated from Harvard University, Zhu Ruochen, who graduated from Duke University, and Li Nuo, a former innovation works "dim sum OS" technical executive. It mainly focuses on Internet inclusive education in primary and secondary schools, with the innovative teaching mode of 100% human-computer interactive learning and the adaptive learning experience of high-quality video courses.