名词
中文翻译：光学正晶体
同义词：
['光学晶体，光学负晶体例句：1. The optical crystals are used in various applications such as telecommunications and optics.（光学晶体被用于各种应用，如电信和光学。）']
例句：
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1. The optical crystals are used in various applications such as telecommunications and optics.
光学晶体被用于各种应用，如电信和光学。
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2. The optical crystal has a high refractive index, which makes it ideal for use in lenses.
光学晶体具有高折射率，这使得它非常适合用于透镜。
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3.The optical crystal is used to analyze the properties of materials at different wavelengths.
光学晶体用于分析不同波长下材料的性质。