Doing so would make the concepts "cat" and "telephone" abstract ideas since despite their varying appearances, a particular cat or a particular telephone is an instance of the concept "cat" or the concept "telephone".
這樣做會令「貓」和「電話」這些不隨外觀而變的概念，變為抽象的觀念，而一個特定的貓或一個特定的電話則會是「貓」或「電話」等概念的一個例子。