内容更新并不及时，塑胶圈装订（Wire-O-Binding）。纸板。
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Wire-O binding 穿铁线圈
Wire-o binding a method of loose-leaf binding in which a continuous double loop of wire runs through punched slots along the binding side of a booklet.
双线圈装用连续的双圈铁丝绕穿过打在书本订口的方孔而成的一种活页装。
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