ring binder
柯林斯词典
1. N-COUNT 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. 活頁夾
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1. N-COUNT 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. 活頁夾