optical glass
柯林斯词典
1. N any of several types of clear homogeneous glass of known refractive index used in the construction of lenses, etc 光学玻璃→see optical flint ,optical crown
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1. N any of several types of clear homogeneous glass of known refractive index used in the construction of lenses, etc 光学玻璃→see optical flint ,optical crown