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(fā)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(fā)現負折射角度有較大的范圍，適合作為可調折射角之光學(xué)元件。
