Yes, one-on-one online course of chemistry in Beijing senior high school and one-on-one course of Longwen Education in Hangzhou explain the principle.

1. One-to-one online course of senior high school chemistry in Beijing: students can learn senior high school chemistry knowledge from teachers at home, and video courseware can be downloaded and played repeatedly offline, and the principles of chemical experiments can be taught.

2. One-on-one course of Hangzhou Longwen Education: We always insist on hiring experienced teachers from various institutions to teach courses. The remedial class includes the explanation of theoretical knowledge and the introduction of experimental principles and methods.