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单词 flint glass
释义

WordReference Random House Unabridged Dictionary of American English © 2024
flint glass′, [Optics.]
  1. Opticsan optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens.
  • 1665–75

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