面对纷纷扬扬飘落的雪花，你有想过它们是如何产生的吗？为什么下雪的时候从天下掉下来的是美丽的六边形雪片而不是一颗一颗的冰粒？今天我们就从科学的角度讨论雪花是如何生成的。
Wow!
哇哦！
I love the sight of snowflakes.
我喜欢看雪。
Aren't they the most mesmerizing thing?
它们不就是最有魅力的东西吗？
So today, I feel like talking all about snowflakes!
所以今天，我想谈谈跟雪花有关的事情。
Zoom in!
放大。
When an extremely cold water droplet comes in contact with dust and freezes on it, ice crystals are formed!
当极冷的水滴与灰尘接触并在上面凝结的时候，就形成了冰晶。
And when those crystals start sticking to each other and falling on the ground, water vapor freezes and sticks on them, building new crystals.
当这些晶体开始粘在一起并落向地面时，水蒸气在它们上面继续凝结，形成新的晶体。
Therefore, snowflakes are formed during really low temperatures.
因此，雪花是在极低的温度下形成的。
There's something absolutely remarkable about snowflakes!
雪花还有一点是绝对与众不同的！
Now, see these two!
现在看这两片雪花！
What do you think is different?
你觉得有什么不同？
Now, see this.
再看这片。
And this.
还有这片。
So, no two snowflakes have the same structure!
所以，没有两片雪花的结构是相同的。
Yes, since every snowflake follows a different path while falling on the ground, they experience different atmospheric conditions.
因为每片雪花在落向地面的时候都有不同的路径，也就会经历不同的大气条件。
And thus, they all tend to look different from each other.
所以它们看起来都不尽相同。
Some look like prisms, while some have a needle like appearance.
有些看起来像棱镜，而有些则看起来像针。
While some have the familiar icy pattern!
而有些则是我们熟悉的形状！
What do you think is the color of snow?
那你觉得雪花是什么颜色的呢？
White?
白色？
Blue?
还是蓝色？
No, actually snowflakes are colorless!
都不是，实际上雪花没有颜色。
That's because snowflakes are translucent, which means that light hardly passes through them and rather gets reflected.
因为雪花是透明的，也就是说光很难穿过它们，而是会被反射回去。
Hence, this creates a white like appearance in the snowflakes!
所以造就了雪花白色的样子。
Since we are talking about appearances, I think I should tell you about the smallest snowflake!
说到雪花的样子，我觉得应该给大家看看最小的雪花长什么样子！
Take a guess, what could be it's size?
猜猜看，它有多大？
No. . .
不是这样……
No. . .
不是这样……
No. . .
也不是这样……
Ahaaan!
啊！
There you go!
是这样！
The smallest snowflake could be as small as a human hair.
最小的雪花有人的头发那么小。
And it has a name too- The Diamond Dust Crystals.
它也有自己的名字——钻石尘晶体。
They are super rare and appear in bitter cold winter.
它们非常罕见，只有在极寒的冬天才会出现。
And the largest snowflake till date is. . .
到目前为止最大的雪花是…
You gotta wait for that till trivia time!
一定要等茶余饭后闲聊的时候说这个话题。
The largest snowflake observed was 15 inches long!
我们观察到的最大的雪花有15英寸长！
Larger than these two pencils put together!
比这两支铅笔加在一起还长！
Each winter in the U. S, at least 1 septillion ice crystals fall on land!
在美国，每年冬天至少有10的八次方片雪花飘落到地面上。
That is. .
也就是……
1,000,000,00. . .
1,000,000,00……
Actually it's 24 zeros!
事实上有24个零。
So, you enjoy the feel of snow snuggled up in your blanket.
所以，你喜欢下雪天依偎在毯子里的感觉。
With a big mug of hot chocolate.
再来一大杯热巧克力。
And don't forget to tune in next time for more fun facts.
下次别忘了收看更多有趣的事实。
This is me, zooming out!
这就是我，再会！
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