我有一张freedom
今天chase给我一封信，告诉我可以用他们家的full pay功能，将开销的特定类别（比
如餐饮买菜之类）单独列出来单独还以避免利息。原文如下
I would also like to inform you that your
card comes with a free Blueprint feature called Full Pay
that can help you avoid paying interest on purchases for
gas, dining and other everyday categories -even if you
carry a balance on other purchases.
我不理解为啥还这些特定的类别可以避免利息？求科普
