ring binder به انگلیسی

 

From Longman Dictionary

ring ˌbinder noun [countable]

a file for holding papers, in which metal rings go through the edges of the pages, holding them in place

Example

It is presented in an A4 ring binder and each section is well indexed

At other levels materials will fit into a larger format ring binder, possibly Deskfax

At the Survival level, packs of loose-leaf materials will be available to fit into a Filofax/Organiser ring binder