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We like to think of romantic feelings as spontaneous and indescribable things that come from the heart.
我們傾向于將浪漫當成是一種來自于內心內心，自發而又而難以言述的行為。
But it's actually your brain running a complex series of calculations within a matter of seconds that's responsible for determining attraction.
但是實際上是你的大腦，在瞬間做出的一系列復雜運算決定了一個人對你的吸引力。
Doesn't sound quite as poetic, does it?
聽起來一點也沒有詩意對吧？
But just because the calculations are happening in your brain doesn't mean those warm, fuzzy feelings are all in your head.
然而，雖然所有的運算都是由大腦完成的，那些溫暖而朦朧的感覺并不僅僅存在于腦海中。
In fact, all five of your senses play a role, each able to vote for, or veto, a budding attraction.
實際上，你的五種感覺都參與其中，各自趨同或者否決了正在萌芽中的吸引力。
The eyes are the first components in attraction.
眼睛是吸引力的第一個裁判。
Many visual beauty standards vary between cultures and eras, and signs of youth, fertility and good health,
不同的文化和時代，對視覺美的標準都有所不同而作為年輕、活力、健康的標志，
such as long lustrous hair, or smooth, scar-free skin, are almost always in demand because they're associated with reproductive fitness.
比如富有光澤的長發或者光滑無疤的皮膚永遠很受歡迎，因為它們也代表著良好的繁殖能力。
And when the eyes spot something they like, our instinct is to move closer so the other senses can investigate.
當眼睛注意到他們喜愛的事物，我們的本能讓我們越靠越近這時其他的感覺也參與其中。
The nose's contribution to romance is more than noticing perfume or cologne.
鼻子對于浪漫的貢獻絕不僅僅是分辨香水或古龍水。
It's able to pick up on natural chemical signals known as pheromones.
它能夠辨別一種被稱作“費洛蒙“的天然的化學信號。
These not only convey important physical or genetic information about their source but are able to activate a physiological or behavioral response in the recipient.
它們不僅傳遞著氣味發出者重要的生理或基因信息，而且能夠激發接收者的心理或行為上的反應。
In one study, a group of women at different points in their ovulation cycles wore the same T-shirts for three nights.
在一個研究中，一組處于不同月經周期的女性連續三個晚上穿著同樣的T恤。
After male volunteers were randomly assigned to smell either one of the worn shirts, or a new unworn one,
之后，男性志愿者被隨機抽取去聞一件穿過的T恤，或者一件新的沒穿過的。
saliva samples showed an increase in testosterone in those who had smelled a shirt worn by an ovulating woman.
唾液樣本顯示那些聞過排卵期女性穿過的T恤的男性睪丸素分泌有明顯的增加。
