聚苯乙烯球的大小可以被改变以适合散射特定波长的光，一种非常重要的可用于安全领域的特性，它能使材料被准确地识别。
The size of the spheres can be tailored to scatter particular wavelengths of light-a useful property for security applications in which it is important that materials can be identified precisely.
当某一特定波长的激光照射声纤时，纤维震动便会改变材料的反射特性，并调节反射的激光。
When a specific wavelength of laser light is shone on them these vibrations alter the reflective properties of the material, modulating the light bouncing off them.
水的发现结果来自在撞击之后对色谱颜色上微小改变的分析，它显示了令人信服的水分子存在的印记，即这些分子吸收了光波的特定波长。
The water findings came through an analysis of the slight shifts in color after the impact, showing telltale signs of water molecules that had absorbed specific wavelengths of light.
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