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Our story is about a girl named Iris.
我們的故事是關于虹膜女孩的。
Iris is very sensitive. So much that she is always in tears.
虹膜很敏感，以至于總是以淚洗面。
She cries when she's sad, when she's happy, and even tears up when things just get to her.
她難過的時候會哭，開心的時候也會哭，甚至被惹惱了，還會哭。
She has special lacrimal glands to make new tears and special tubes, called lacrimal puncta, to drain old ones away.
她的特殊淚腺可以分泌新淚水，它還有叫做淚道的特殊管道，用來排走眼淚。
And she cries so much that she goes through ten ounces of tears per day, thirty gallons a year!
她哭得很厲害，每天會流掉十盎司的淚水，一年就是三十加侖！
In fact, if you look closely, you'll see that she's crying a little bit all the time.
事實上，如果你仔細觀察，會發現她無時不刻都流點兒眼淚。
The basal tears that Iris constantly produces form a thin coating of three layers that cover her and keep dirt and debris away.
虹膜不斷產生的基底眼淚，形成薄薄的三層外膜，防止她接觸灰塵、碎屑。
Right next to Iris is the mucus layer, which keeps the whole thing fastened to her.
緊挨著虹膜的是粘液層，它給她固定了整個架構。
On top of it is the aqueous layer, which keeps Iris hydrated, repels invasive bacteria, and protects her skin, or cornea, from damage.
黏液層上面的是水層，用來保持虹膜濕潤，趕走侵入性細菌，并保護她的皮膚或角膜，保護她免受侵害。
And, finally, there is the lipid layer, an oily outer film that keeps the surface smooth for Iris to see through, and prevents the other layers from evaporating.
最后還有脂質層，它是一層保持表面平滑的油性外膜，方便虹膜透視，也防止其他層的蒸發。
Normally, Iris goes about her day without really noticing the basal tears doing their thing.
通常情況下，虹膜整天都沒注意默默工作的基底眼淚。
That's kind of their whole point.
某種程度上說，這是它們的存在價值。
But one day, she meets a girl named Onion.
直到有一天，她遇到了一個叫做“洋蔥”的女孩。
Iris is immediately smitten.
虹膜倍受打擊。
Onion looks gorgeous in her bright purple jacket, and she smells terrific.
洋蔥在她明亮紫色外套的烘托下看起來很華麗，并且聞起來棒極了。
So, Iris invites Onion to her house for dinner.
于是，虹膜邀請洋蔥來家里吃晚餐。
But when she comes in and takes off her jacket, something terrible happens.
當洋蔥進屋并且脫下外套時，可怕的事情發生了。
You see, when Onion's jacket is removed, a chemical reaction happens, converting the sulfoxides that make her smell so great into sulfenic acid, which then becomes a nasty substance with a long name: syn-Propanethial S-oxide.
你看，當洋蔥脫下外套時，一個化學反應發生了，讓她很好聞的亞砜轉化成了次磺酸，進而變成一個有巨長名字的討厭物質：丙硫醛-S-氧化物。
