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参考答案

There are three main features of metaphors: systematicity, creation of similarities, and imaginative rationality.

1) Metaphors are systematic precisely because they are conceptual in nature. 

2) Metaphors can create similarities between the two domains involved. We use metaphors to create similarities and correlations between two separate categories, so that we can understand one kind of experience in terms of another.

3) Metaphors are also characterized by imaginative rationality. They unite reasoning and imagination. Metaphors as a form of reasoning by analogy involve categorization, entailment and inference. The source domain is always an expression that denotes something physical and concrete, while target domain refers to something abstract. The primes of conceptual structures are called image schemas.