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From the above analysis, it can be seen that this situation can be counted as situation 2, but I feel that it is clearer and more reasonable to separate it separately. When analyzing situation 4, I will also explain some reasons. At the same time, this is also an application of the first two situations. If I understand situation 1 and situation 2, many other situations not mentioned in this article can be explained.In essence, classification is to find the common points and differences of things in our thoughts. It is the basic method and ability for us to know and understand the world. On the basis of classification, it is possible to judge and reason, and to form concepts and make decisions. Classification requires comprehensive demonstration activities such as association, analogy, reasoning and extension, and is the basic cell of thinking.Hard disk is a kind of hardware, which is used to store files. Floppy disk is also a kind of storage device. It can only be used by floppy disk. Now it is only 1.44 MB, and its capacity is too small. It is generally not used now. Now it has been gradually replaced by U disk.他用竹耙子将松针掏出来，拢在一处，拢了两大堆。