- 双: two; twin; both; dual
- 环: ring; hoop
- 衔铁: armature; anchor; armature i ...
- 双环: bicycle; bicyclic ring; dicyclo; dual homing; twin circle
- 衔铁: [电学] armature; anchor; armature iron; reed; keeper◇衔铁振动[颤动] armature chatter
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