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The gas stings Iris, and suddenly, she can't help it, she starts weeping uncontrollably.
這種氣體刺激著虹膜，來勢洶洶，她無力阻止，于是她開始控制不住地大哭。
These reflex tears are different from the basal tears that Iris is used to.
這種反應性的眼淚與虹膜經常流的基底眼淚不同。
Because they're designed to wash away harmful substances, or particles, they're released in much larger amounts, and their aqueous layer contains more antibodies to stop any microorganisms that may be trying to get in, as well.
因為，它們是為了沖掉有害物質或顆粒。它們的流量更大，并且水層中包含的大量抗體，也是為了阻止可能進入眼睛的微生物。
Both Iris and Onion are devastated.
虹膜和洋蔥都震驚了。
They know they can't continue their relationship if Iris is going to hurt and cry every time Onion takes off her jacket.
她們知道，如果每次洋蔥脫下外套，虹膜就會受到傷害并且哭泣的話，她們就無法繼續做好朋友了。
So, they decide to break up.
于是，她們決定絕交。
As Onion walks out the door, Iris stops crying.
當洋蔥走出房門時，虹膜停止了哭泣。
And immediately starts again.
緊接著她又開始哭。
Only now, she's not crying reflex tears but emotional tears.
但是這次，她并不是反射性流淚，而是動情落淚。
When someone is either too sad or too happy, it feels like a loss of control, which can be dangerous.
當一個人太難過或太開心的時候，就會感到失控，這是很危險的。
So, emotional tears are sent in to stabilize the mood as quickly as possible, along with other physical reactions, such as an increased heart rate and slower breathing.
因此，留下動情的淚水可以和其他物理反應一起，比如加快心率和減緩呼吸，來盡快穩定情緒。
But scientists still aren't sure exactly how or why the tears themselves are helpful.
但是科學家們仍無法確定眼淚為什么或如何起到效用的。
They may be a social mechanism to elicit sympathy or show submission.
它可能是一種博取同情或者表達意見的社會機制。
But some studies have also found that emotional tears contain higher levels of stress hormones, such as ACTH and enkephalin, an endorphin and natural pain killer.
但是某些研究也發現，動情留下的淚水中包含較高濃度的應激激素，比如促腎上腺皮質激素和腦啡肽，后者是一種內啡肽，可以自然止痛。
In this case, emotional tears are also directly calming Iris down, as well as signaling her emotional state to others.
在這種情況下，動情淚水也可以讓虹膜冷靜下來，以及向別人傳遞她的情緒。
Sorry things didn't work out with Onion, Iris, but don't worry.
很抱歉，虹膜，你不能和洋蔥做朋友了，但是別擔心。
As long as you have all three kinds of tears working to keep you balanced and healthy, it will get better.
只要你擁有這三種淚水來保持你的健康均衡，一切都會好起來。
You'll see.
你會看到的。
