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枘：榫头；凿：榫眼。方榫头，圆榫眼，两下里合不来。比喻格格不入。
[like a square tenon for a round mortise——at variance with each other] 圆凿,指圆的卯眼;方枘,指方的榫头。圆孔不能容纳方榫头,比喻彼此不能相合
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