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对于一些没有价值的材料,我们应当让它遗忘掉,以减轻大脑的负担。但是,对于许多很有价值的记忆材料,我们却一定要记住它。如学化学时对某种元素的原子量、化合价、一些重要的分子式,物理学上一些常用的参数、物体的比重,历史课本里重要历史事件发生的时间,等等。为了增强记忆,就需要跟遗忘作斗争。分散记忆是跟遗忘作斗争的办法之一。一般说来,要达到同样的识记效果,材料越多,平均用的时间或诵读的次数也越多。如果深度大体相同,背诵一首七律要比背诵两首七绝更难些。要背诵李白的《梦游天姥吟留
For some worthless materials, we should let it be forgotten in order to reduce the burden on the brain. However, for many valuable memory materials, we must remember it. For example, when studying chemistry, the atomic weight, valence, certain important molecular formulas of certain elements, some commonly used parameters of physics, the proportion of objects, the time of occurrence of important historical events in history textbooks, and so on. In order to enhance memory, you need to fight against forgetting. Dispersing memory is one of the ways to fight forgotten. Generally speaking, to achieve the same memorizing effect, the more materials there are, the greater the average time or the number of readings. If the depth is about the same, recitation of a seventh law is more difficult than recitation of two sevens. To recite Li Bai’s “Sleep in Heaven”