Contrast is a means of expression to arrange two parties with obvious differences, contradictions and opposites together for comparison. Or put two opposing and relative things or two opposing and relative aspects of the same thing together and describe or explain them by comparison. That is to say, two different, opposite and related things, or two different, opposite and related aspects of the same thing, are compared together to make them complementary, so as to show the characteristics of things more vividly. This expression is called contrast, also called contrast.
The so-called analogy is a form of reasoning that infers that two objects may be the same or similar in other properties from some identical or similar properties of two objects. Analogy is a method of reasoning. According to the similarity of two things in some features, it is concluded that they may be similar in other features. For example, both light and sound travel in a straight line, including reflection, refraction and interference. Because sound is in a state of fluctuation, it is inferred that light is also in a state of fluctuation. Analogical reasoning is a kind of probabilistic reasoning, and whether its conclusion is correct remains to be proved by practice. Analogy is a subjective and inadequate specious reasoning. Therefore, to confirm the correctness of its conjecture, we must go through strict logical argumentation. It can be seen that the key to using analogy method is to find a suitable analogy object and make different analogies according to the angle of finding the analogy object.