- negative birefringence
- negative catalyst
- 负: burden; load
- 双折射: double refraction; birefring ...
- 负双折射率: negative birefringence
- 双折射: double refraction; birefringence◇双折射晶体 birefringence crystal; 双折射矿物 doubly refractive mineral; 双折射片 birefringent plate; 双折射性 birefringence
- 重折射双折射: twin pearl
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