binocular coil
... binocular 两眼的，双目的，双筒的 binocular coil 双孔线圈，双筒线圈 binode 双阳极的，双阳极电子管 ...
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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。
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.
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