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Emergency help: What is the explanation method used in the fifth paragraph of Space Migration is not a Dream (Chinese)?

Comparison: select external or internal related things for comparison. Comparison includes analogy and contrast, and the analogy of similar things is to illustrate the same point; The contrast of different kinds of things is to highlight the differences. By using the comparative interpretation method, we can simplify things, simplify things, explain things more clearly and vividly, and enhance the interpretation effect.