折疑論 4.37

4.37

牛即掉尾奮耳。蹀躞而聽者何也。蓋適其所知也（蹀躞蹄動貌。牛聞此聲遂乃掉動其尾奮立兩且。四足皆動。如此聽之者何為也。大概順其所知者也蹀音牃躞音泄）。

why did the cow at once switch its tail, prick up its ears, and pace about listening? It was because the sound suited what it knew (蹀躞 is the appearance of hooves moving. Upon hearing this sound, the cow then switched its tail, pricked up both ears, and moved all four feet. Why did it listen like this? In general, it accorded with what it knew. 蹀 is pronounced 牃; 躞 is pronounced 泄).