面對紛紛揚揚飄落的雪花，你有想過它們是如何產生的嗎？為什麼下雪的時候從天下掉下來的是美麗的六邊形雪片而不是一顆一顆的冰粒？今天我們就從科學的角度討論雪花是如何生成的。
Wow!
哇哦！
I love the sight of snowflakes.
我喜歡看雪。
Aren't they the most mesmerizing thing?
它們不就是最有魅力的東西嗎？
So today, I feel like talking all about snowflakes!
所以今天，我想談談跟雪花有關的事情。
Zoom in!
放大。
When an extremely cold water droplet comes in contact with dust and freezes on it, ice crystals are formed!
當極冷的水滴與灰塵接觸並在上面凝結的時候，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.
當這些晶體開始粘在一起並落向地面時，水蒸氣在它們上面繼續凝結，形成新的晶體。
Therefore, snowflakes are formed during really low temperatures.
因此，雪花是在極低的溫度下形成的。
There's something absolutely remarkable about snowflakes!
雪花還有一點是絕對與眾不同的！
Now, see these two!
現在看這兩片雪花！
What do you think is different?
你覺得有什麼不同？
Now, see this.
再看這片。
And this.
還有這片。
So, no two snowflakes have the same structure!
所以，沒有兩片雪花的結構是相同的。
Yes, since every snowflake follows a different path while falling on the ground, they experience different atmospheric conditions.
因為每片雪花在落向地面的時候都有不同的路徑，也就會經歷不同的大氣條件。
And thus, they all tend to look different from each other.
所以它們看起來都不盡相同。
Some look like prisms, while some have a needle like appearance.
有些看起來像稜鏡，而有些則看起來像針。
While some have the familiar icy pattern!
而有些則是我們熟悉的形狀！
What do you think is the color of snow?
那你覺得雪花是什麼顏色的呢？
White?
白色？
Blue?
還是藍色？
No, actually snowflakes are colorless!
都不是，實際上雪花沒有顏色。
That's because snowflakes are translucent, which means that light hardly passes through them and rather gets reflected.
因為雪花是透明的，也就是說光很難穿過它們，而是會被反射回去。
Hence, this creates a white like appearance in the snowflakes!
所以造就了雪花白色的樣子。
Since we are talking about appearances, I think I should tell you about the smallest snowflake!
說到雪花的樣子，我覺得應該給大家看看最小的雪花長什麼樣子！
Take a guess, what could be it's size?
猜猜看，它有多大？
No. . .
不是這樣……
No. . .
不是這樣……
No. . .
也不是這樣……
Ahaaan!
啊！
There you go!
是這樣！
The smallest snowflake could be as small as a human hair.
最小的雪花有人的頭髮那麼小。
And it has a name too- The Diamond Dust Crystals.
它也有自己的名字——鑽石塵晶體。
They are super rare and appear in bitter cold winter.
它們非常罕見，只有在極寒的冬天才會出現。
And the largest snowflake till date is. . .
到目前為止最大的雪花是…
You gotta wait for that till trivia time!
一定要等茶餘飯後閒聊的時候說這個話題。
The largest snowflake observed was 15 inches long!
我們觀察到的最大的雪花有15英寸長！
Larger than these two pencils put together!
比這兩支鉛筆加在一起還長！
Each winter in the U. S, at least 1 septillion ice crystals fall on land!
在美國，每年冬天至少有10的八次方片雪花飄落到地面上。
That is. .
也就是……
1,000,000,00. . .
1,000,000,00……
Actually it's 24 zeros!
事實上有24個零。
So, you enjoy the feel of snow snuggled up in your blanket.
所以，你喜歡下雪天依偎在毯子裡的感覺。
With a big mug of hot chocolate.
再來一大杯熱巧克力。
And don't forget to tune in next time for more fun facts.
下次別忘了收看更多有趣的事實。
This is me, zooming out!
這就是我，再會！