Ebbinghaus's Forgetting Curve shows that forgetting follows a pattern and is not uniform: Initially, the rate of forgetting is rapid, then it gradually slows down, and eventually, after a long period, forgetting almost stops. The compilation of Onli textbooks addresses this "forgetting pattern" by repeatedly and engagingly presenting key knowledge points across lessons, units, and books. This ensures that students can retain as much as they learn and use as much as they retain.

All-English Instruction: Provide students with an English-only environment. This helps them get used to listening, speaking, and thinking directly in English, eliminating the need for mental translation. They quickly grasp pronunciation habits and language intuition, develop native-like reflexes, cultivate English thinking, and speak standard English.