But I could have another idea in my mind, which I label "centaur" but for which no corresponding fact can be found in the extramental world.

但是我头脑里还有另外一个叫“人马”的特定观念，可这一观念在脑外世界里找不到相对应的事物。

youdao

For instance, I have a particular idea in my mind, which I label "cat". Corresponding to that idea are actually existing things in the extramental world called "cats."

例如，我头脑里有个“猫”的特定观念，与之对应的是确实在脑外的世界里存在叫“猫”的事物。

youdao