成语寓言：买椟还珠 Idiom and Fable: Buying the Case but Returning the Pearl
这则成语最早出自战国时期的《韩非子·外储说左上》，比喻看不清事物的本质，不能分清主次。
This idiom first came from "Han Fei Zi" in the Warring States Period (3rd century BC). This idiom is a metaphor for not seeing the essence of things.
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