"比喻表达法" can be translated into English as "figurative expression" or "metaphorical expression".
"Figurative expression" is a broader term that encompasses various forms of figurative language, including metaphors, similes, personification, etc.
"Metaphorical expression" is more specific, focusing directly on the use of metaphors as a means of expression.
Both terms are appropriate depending on the context and the specific type of figurative language being discussed. In a general sense, "figurative expression" might be more commonly used to cover the wider range of figurative devices.