- duplicate insulator
- 二重: two-fold; double
- 绝缘体: insulator; isolater; non-con ...
- 双重绝缘: double insulation
- 双重绝缘的: double insulated
- 绝缘体: dielectric; disconnector; electrical insulation; i ulator; iaolator; insulant; insulated body; insulators; isolator; nonconductor
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