What does it mean to be one in a million?
百万分之一意味着什么？
Not in the greeting card sense, in the scientific sense,
我指的并非贺卡上写的万中选一，从科学的角度来说，
where one part per million is a unit of measurement.
百万分率是一个计量单位。
Parts per million counts the number of units of one substance per one million units of another.
百万分率是计算某一种物质在百万个另一种物质中占有的数目。
It can measure concentrations when a small amount makes a big difference.
在测量浓度时，百万分率的微小误差会导致两种完全不同的结果。
For example, a concentration of just 35 ppm of carbon monoxide in the air is poisonous to us.
例如，空气中的一氧化碳就算浓度只有35ppm，对我们而言都是有毒的。
We encounter measurements like this pretty often,
我们经常会遇到这样的测量，
but because it's hard to conceptualize really large numbers,
但是，因为很难对如此巨大的数值形成清晰的认识，
it's difficult to wrap our brain around what one part per million really means.
我们的大脑很难解读百万分之一的真正含义。

So here are nine helpful ways to visualize it.
那么，现在这里有九个帮助想象的方法。
If you had 11,363 pianos-worth of piano keys, one of those keys would be about one part per million.
如果你有11363台钢琴，那些钢琴键中的一个就会是一百万分之一。
So would a single granule of sugar among 273 sugar cubes, one second in eleven and a half days,
同样，273颗糖立方中的一个颗粒，十一天半时间中的一秒，
or four dots in the painting, 'A Sunday Afternoon on the Island of La Grande Jatte.'
或者《大碗岛的星期日下午》这幅画上的四个点，也是百万分之一。
Your bath tub's capacity is about 60 gallons, so seven drops of ink would be one part per million.
一般浴缸的蓄水量是60加仑，所以七滴墨水是百万分之一。
The English version of the Harry Potter series has 1,084,170 words,
英文版的哈利波特系列共有1084170个单词，
which makes 'hippogriff' on page 221 of 'The Prisoner of Azkaban' a little less than one part per million.
使得《阿兹卡班的囚徒》221页的《骏鹰》略少于百万分之一。
A million kernels of corn is about 1,250 ears,
1250根玉米棒大约有一百万颗玉米粒，
so one kernel in that truckload would be one part per million.
因此载满一卡车里的一颗谷粒是百万分之一。
There are 10 million bricks in the Empire State Building,
帝国大厦的建造使用了1000万块砖头，
so one part per million would be a pile of just ten.
那么，帝国大厦的一百万分之一就会是十块砖头。
And finally, 100 people worked together to animate this video.
最后，100个人一起创作了这个视频。
Collectively, they have about 10 million hairs on their heads.
把他们的头发加起来约有一千万根。
Pluck ten of those hairs, and you have one in a million.
如果拔下十根头发，那么这就是百万分之一。