It shows that, for the one-dimensional photonic crystals, there are abnormal refraction in the first band.

结果表明，对于一维光子晶体，在第一能带内，存在反常折射现象。

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It has been shown by studying the radar echo top heights that the abnormal refraction of the atmosphere can cause obvious errors in the radar measurements of height.

研究天气雷达测定回波顶高的几种误差表明：大气异常折射会引起回波顶高明显误差。

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