单词：refraction index
refraction index的用法和样例：
例句
- The wings of the glasswing must, therefore, have the same refractive index all the way through them as otherwise this transparency could not possibly occur.因此，玻璃翅的翅翼必须具有相同的折射指数，否则很可能不会透明。
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英语单词大师-Word Master
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