I have a cat,one whose color is red.

问题描述:

I have a cat,one whose color is red.
既然是定语,为什么不简单点直接把one和逗号去掉,干吗来个one后再用定从修饰one?这种定语从句有啥特殊的名字没?

one代指同类事物或动物