时差N小时 荧光色(下)

Ultraviolet light, or UV, is just beyond visible violet in the spectrum¹.

紫外线（UV）频率恰好在可见紫色光之外。

Its wavelength² is too short to be visible to the naked eye, but you see it working when fluorescent³ colors glow!

紫外线的波长太短而肉眼无法看到，但是荧光色发光的时候你就能看到紫外线照射的效果！

Regular dyes just absorb UV along with all the other wavelengths⁴ they don’t reflect, so you don’t see any evidence of it.

一般的染料只吸收紫外线和所有其他不反射的光，因此你无法看到紫外线。

But, fluorescent dyes contain substances that respond to UV.

但是，荧光染料含有对UV起反应的物质。

Some of the molecules⁵ in these fluorescent dyes are excited by UV energy, and afterwards, as the energy level within these molecules decreases, they release part of that extra energy as visible light.

这些荧光染料中的一些分子被UV的能量激活，然后，随着这些分子的能量水平下降，它们就会释放一部分额外的能量形成可见光。

So fluorescent dyes turn invisible energy into visible light, and that’s how the magic trick works!

因此，荧光染料把不可见的能量转换成了可见光，这就是魔术的原理！

They don’t reflect more energy than they receive, but they do reflect more visible light, converted from parts of the spectrum we can’t see.

它们并不是反射出所接收的额外能量，而是反射出了更多的可见光，这些可见光是由肉眼看不到的波段转换而来的。

1 spectrum   

n.谱，光谱，频谱；范围，幅度，系列

参考例句：

• This is a kind of atomic spectrum.这是一种原子光谱。
• We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。

2 wavelength   

n.波长

参考例句：

• The authorities were unable to jam this wavelength.当局无法干扰这一波长。
• Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。

3 fluorescent   

adj.荧光的，发出荧光的

参考例句：

• They observed the deflections of the particles by allowing them to fall on a fluorescent screen.他们让粒子落在荧光屏上以观察他们的偏移。
• This fluorescent lighting certainly gives the food a peculiar color.这萤光灯当然增添了食物特别的色彩。

4 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

5 molecules   

分子( molecule的名词复数 )

参考例句：

• The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
• Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。