“多亏了我的志愿者老师，我的生活改变了很多。我会努力学习，成为像她一样优秀的人，”当地学生李素梅兴奋地说。

"Thanks to my volunteer teacher, my life has changed a lot. I will study hard and become an excellent person like her," Li Sumei, a local student, says excitedly.

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当一段新的恋情开始时，你总会感觉到肾上腺素的飙升，此时你心跳加速，头晕目眩，你变得清醒，机敏和兴奋。

Young relationships start out with an adrenaline rush. Your heart RACES, you get giddy, you're alert, awake and excited.

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多巴胺被认为是“快乐激素”，产生喜悦感；去甲肾上腺素类似于肾上腺素，导致心跳加速和兴奋感，据来自美国罗格斯大学的人类学家，著名的爱情研究者Helen Fisher所说，这两种化学物质共同引起喜悦感，充沛的精力，失眠，强烈的愿望，食欲的减退和集中的注意力。

Dopamine is thought to be the "pleasure chemical, " producing a feeling of bliss. Norepinephrine is similar to adrenaline and produces the racing heart and excitement.

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