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Why is black and white more suitable for big newspapers?
This is a scanned copy, so the photos are all black and white.

When collecting papers, most of them are actually scanned, not electronic. The scanned paper is cardboard, so it is black and white.

Classical literature refers to talking and exchanging ideas, and now it refers to articles that conduct research and describe academic research results in various academic fields. A paper generally consists of title, author, abstract, key words, text, references and appendix.