ring-binder活页簿
4-Ring Data Binder孔活页计算机夹
three-ring binder三孔档案夹
Insert Ring Binder面脊插页活页夹
D ring binder装订机
Ring Binder Designed活页设计
a ring binder活页夹
in ring binder用带环的资料夹
N-COUNT（可数名词） A ring binder is a file with hard covers, which you can insert pages into. The pages are held in by metal rings on a bar attached to the inside of the file. 活页夹