【英语时差8,16】为什么有的车头灯是蓝色的？

 This is because the shorter the wavelengths¹ of light, the better it scatters³ off of air and water particles. Blue Light So blue light, which has very short wavelengths, is much more likely to scatter² than the longer wavelengths, like red light. This means that when blue light hits the water particles, it’s more likely bounce off, going back into your eyes, and reducing your ability to see through the fog. It also increases the glare for everyone, since blue light scatters better inside our eyes as well. In the regular headlights, there are still a fair amount of smaller wavelengths, so it scatters too. But since it also has more of the longer wavelengths, more light gets through the fog. So you can still see–sort of.

1 wavelengths   

n.波长( wavelength的名词复数 )；具有相同的/不同的思路；合拍；不合拍

参考例句：

• I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
• Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句

2 scatter   

vt.撒，驱散，散开；散布/播；vi.分散，消散

参考例句：

• You pile everything up and scatter things around.你把东西乱堆乱放。
• Small villages scatter at the foot of the mountain.村庄零零落落地散布在山脚下。

3 scatters   

v.（使）散开， （使）分散，驱散( scatter的第三人称单数 )；撒

参考例句：

• He scatters money about as if he were rich. 他四处挥霍，好像很有钱。 来自《简明英汉词典》
• Truth raises against itself the storm that scatters its seeds broadcast. 真理引起了反对它自己的狂风骤雨，那场风雨吹散了真理的广播的种子。 来自辞典例句