negative refraction的用法和樣例：
例句
- To understand how negative refraction can arise, one must know how materials affect electromagnetic waves.
要了解負折射如何發生，我們必須先知道材料如何影響電磁波。 - The tunability was analysed at the specified frequency and a large tunable range of the negative refraction is achieved.
發現負折射角度有較大的範圍，適合作為可調折射角之光學元件。
