偶數(shù)?！端问贰?a href="/hycd/y/y78263.htm" target="_blank">輿服志四》：“古者制禮上物，不過(guò)十二，天之?dāng)?shù)也。自上而下，降殺以?xún)?。畿?a href="/hycd/z/z355380.htm" target="_blank">諸侯，遠(yuǎn)於尊者而伸，則以九、以七、以五，從陽(yáng)奇之?dāng)?shù)；王朝公卿大夫，近於尊者而屈，則以八、以六、以四，從陰偶之?dāng)?shù)?！?/p>