That pair of glassess is not good. I want to buy a new pair.
为什么不能说成I want to buy a new one 呢?我用one 指代pair不行吗?
one 或 ones 不能代替含有成双意义的名词。
I like the shoes. I want to buy a pair. (不可说 to buy one 或 ones)
(以上摘自《中学英语疑难千问千答》p.93)
That pair of glassess is not good. I want to buy a new pair.
这里的 pair 是含有成双意义的名词,所以不能用one 指代pair。