Wait, Tattoo Lasering Is Insane! · Kurzgesagt – In a Nutshell
了解纹身激光去除的原理与过程，适合练习英语听力和阅读理解，内容涵盖科技与健康领域。
Very tasteful art!
这艺术作品真是品味非凡！
Oh, you hate it?
哦，你讨厌它？
You are not alone!
你并不孤单！
One in four people with a tattoo regret it, 25 million people in the US.
每四个有纹身的人中就有一个会后悔自己纹了纹身；在美国，这样的纹身者总数达到了2500万人。
Getting ink carved into your body permanently has exploded in popularity in the last few decades, especially among Millennials.
在过去几十年里，将纹身永久性地刻入人体这种行为变得极为流行，尤其是在千禧一代中。
Often their tattoos were about a current
他们的纹身往往与当下发生的某些事情有关。
cultural thing, a moment in their life, following a trend, expressing individuality or about feeling like being part of something greater.
这其实是一种文化现象，反映了人们生命中的某个特定时刻；他们可能是为了追随某种潮流、展现自己的个性，或是希望感受到自己属于某个更广阔的集体/社群的一部分。
This is all fine and good but as people age they often stop identifying with what their younger versions wanted on their skin forever.
这一切固然很好，但随着年龄的增长，人们往往会不再认同自己年轻时所追求的皮肤状态（即年轻时希望自己的皮肤应该具备的特征）。
Or sometimes their tattoos simply just look ugly or have aged badly.
有时候，他们的纹身看起来很丑，或者已经严重褪色（即外观变得非常糟糕）。
And so today laser tattoo removal is booming, being as normalized as dentist appointments.
因此，如今激光去除纹身的技术正在蓬勃发展，已经变得和看牙医一样普遍了。
Which is wild since lasering a tattoo away is one of the most metal things you can do to your body.
这确实很奇怪——因为用激光去除纹身其实是对身体“进行改造”（或“改变外观”）的最极端、最“前卫”的方式之一啊。
A high tech procedure that is extremely painful and makes your skin explode from the inside.
这是一种高科技医疗程序，过程极其痛苦，会导致皮肤从内部开始“破裂”（即出现严重的损伤）。
How does it work?
它是如何工作的？
We explained what a tattoo is in
我们解释了什么是纹身。
detail before, but in a nutshell: From the perspective of your cells your tattoo is a mountain range of colourful boulders,
之前已经详细解释过了，但简单来说：从你身体细胞的角度来看，你的纹身就像一片由五彩斑斓的巨石组成的山脉。
from small to building-sized.
从小型的到建筑规模的。
Injected deep into your dermis by violently ripping huge wounds with gigantic needles.
通过使用巨大的针头在皮肤上制造出深深的伤口，将药物注入真皮层。
Your body is trying hard to destroy
你的身体正在努力摧毁那些有害物质（或病原体）。
the tattoo, but the ink particles are way too large to be transported away and your immune cells can’t eat them.
虽然有纹身，但由于墨水颗粒的体积太大，它们无法被身体排出；同时，你的免疫细胞也无法吞噬这些颗粒。
So they do the next best thing: Keeping the ink trapped in a prison of flesh.
于是，他们采取了次优的选择：将墨水“囚禁”在人体的肌肉组织中（即让墨水无法扩散到身体其他部位）。
This is why tattoos remain forever, millions
这就是为什么纹身会永远留在皮肤上，而且这样的纹身数以百万计。
of your cells give their lives to keep the ink in place – when they die new ones take their place.
你的细胞中有一部分会“牺牲”自己，以保持墨水在纸张上的位置；当这些细胞死亡后，新的细胞会取代它们的位置。
In principle removing a tattoo is very easy: Just destroy the ink particles.
从原理上讲，去除纹身非常简单——只需要破坏那些墨水颗粒即可。
The hard part is to do that without destroying you.
最困难的部分在于：如何在不会自我毁灭的情况下做到这一点。
Amazingly the best way is still to blast you with a deadly laser.
令人惊讶的是，最有效的攻击方式仍然是用致命的激光束来攻击你。
Lasers, UV light, wifi or x-rays are
激光、紫外线、无线网络（Wi-Fi）或X射线都属于这类技术/设备。
all the same thing: Electromagnetic radiation, photons that travel through space at the speed of light in the form of a wave.
其实都是一回事：电磁辐射，即以波的形式在太空中以光速传播的光子。
The more energetic they are, the higher their frequency and the more punch they carry.
他们的能量越充沛，其振动频率就越高，所传递的冲击力也就越强。
Imagine your skin as jelly and your tattoo as crumbs of toast.
想象一下：你的皮肤就像果冻一样柔软，而你的纹身则像是吐司碎屑一样附着在皮肤表面。
If you shine a flashlight against it,
如果你用 flashlight 照向它，
most light passes right through the jelly – but the darker toast crumbs absorb more light and are clearly visible.
大部分光线能够直接穿过这种“果冻状物质”；而颜色较深的吐司碎屑则会吸收更多的光线，因此显得更加明显（即更容易被观察到）。
Likewise, certain laser frequencies mostly pass through your skin without doing damage, while dark ink particles soak them up.
同样地，某些激光频率基本上可以穿透皮肤而不会造成损伤，而深色墨水颗粒则会吸收这些激光能量。
Depending on the colour of your tattoo, we need different lasers.
根据您纹身的颜色，我们需要使用不同的激光设备。
Red ink reflects red light but absorbs green light – so you need a green laser.
红色墨水会反射红光，同时吸收绿光；因此你需要使用绿色激光器。
Black ink easily absorbs all types of light and is the easiest to remove.
黑色墨水能够轻易吸收各种类型的光线，因此也是最容易清除的墨水。
But even with the right colour, tattoo removal lasers are still pretty powerful and can still leave horrible injuries,
但即使使用了合适的激光波长，用于去除纹身的激光设备依然具有相当高的能量，仍有可能造成严重的伤害。
scars, or change your skin colour permanently.
疤痕，或者使你的皮肤颜色永久性地发生变化。
So instead of shooting your skin with
所以，与其用那种东西“伤害”你的皮肤，不如……
a continuous ray of death, modern tattoo
一条持续不断的死亡之射线”——现代纹身图案
removal lasers shoot an extremely brief pulse – a packet of electromagnetic energy that lasts about a few trillionoth of a second.
用于移除物体的激光器会发射一个极其短暂的脉冲：这个脉冲是一包电磁能量，持续时间仅约为几万亿分之一秒。