沿路追寻简单的幸福

今晚的课，上得一直想掉眼泪。
爱情的化学因素，无论时代再变迁，从不会改变。

The emotions we feel when we're in love are so powerful when they're going on, 
nobody's going to stop think about chemicals in the brain.
人们坠入爱河时的情感非常之强烈，当时绝对没有人会停下来考虑大脑里的化学成分。

The symptoms of attraction--falling in love--are very much like what happens when you take an artificial stimulant.
Your heart beats faster, your energy goes up, you feel optimistic.
恋爱的征兆，就像你服用了人工兴奋剂所产生的情况。
你的心跳加快，精力充沛，感觉乐观。
 
When a close relationship ends or when we are afraid that it might end,
production of endorphins stops and we're thrown into a panic.
当亲密的关系终结或当我们担心可能终结时，内啡肽不再生产，而我们也置于恐慌的心境之中。

What's intense in a relationship is the newness.
That's why the great romances of literature are never between people who stay together.
在一段爱情里最强烈的就是新鲜感。
这就是为什么在著名的浪漫爱情文学作品中不曾有进入婚姻的男女主角。