If you have also passed CET-4, CET-6, IELTS, TOEFL, SAT … …, you must have heard of this person: Ebbinghaus. The name [Ebbinghaus] is always associated with [memory] [forgetting] and so on. People may be more familiar with [memory law] or [forgetting law], and they have been taught countless times by teachers since childhood: memorizing formulas, memorizing texts and memorizing words. Memorizing words is most afraid of forgetting. Research shows that the speed of forgetting is closely related to the length of the interval: the speed of forgetting is the fastest just after memory, and then the speed of forgetting gradually slows down.