The definition of a dream is the experience in a dream, and deduction is a Chinese vocabulary, which means layout and expression. Metaphor is the inference that a conclusion must be drawn from a premise, another proposition is deduced from some hypothetical propositions with logical rules, and the conclusion under special circumstances is deduced from general principles.
From a psychological point of view, dreams are a window for the conscious to see the unconscious.
Freud and Jung were pioneers of western dream interpretation (Duke Zhou). I hope my answer is helpful to you.