I want to buy a proper gift for my mother,__one that__ sill be cheap but will make her happy

问题描述:

I want to buy a proper gift for my mother,__one that__ sill be cheap but will make her happy

one
这里one是a proper gift的同位语,对于a proper gift进行补充说明作用.
翻译为:我希望买一个合适的礼物给我母亲,一个便宜但是可以让她高兴的礼物.