Secondly, the main purpose of classification abstraction is to facilitate memory and form a systematic knowledge module. This is still used more in the process of learning. The same attribution, summed up together, is much more efficient to master.
Third, write your feelings next to good sentences. This kind of excerpt is not used much, or students don't use it much. But teachers are often regarded as a way of extraction. Especially in the process of preparing lessons, teachers often use this abstract form, which is suitable for senior students who use independent thinking and dialectical consciousness.
Fourth, the extract should indicate the source. This is mainly for the convenience of searching again. First, find a reasonable basis for your own excerpts. Abstraction is not just writing a few words, even if it is abstract, there must be a source and a source.
Excerpts are embodied in the form of notebooks, or extract cards are made. Notebooks are suitable for large-scale extraction, and extraction cards are suitable for short-term, beautifully displayed, or more important extracts that need to be used in the short term.