three-ring binder三孔档案夹
six-ring binder六环活页文件夹
4-Ring Data Binder孔活页计算机夹
同义词：binder
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