脈陰陽(yáng)相乘相伏之象。如寸部雖見(jiàn)浮滑而長(zhǎng)的陽(yáng)脈,但有時(shí)夾有沉澀而短的陰脈,故稱?!?a target="_blank" href="/zhongyi/zy77739ry/">難經(jīng)·二十難》:“脈雖時(shí)沉澀而短,此謂陽(yáng)中伏陰也?!?/p>