时差N小时 我们为何要接吻(上)

Do you have any idea why people kiss？Well down, the simple answer is just because it feels good. Our lips are full of sensitive nerve endings, which activate¹ sensory² areas in the brain. Kissing boosts the levels of neurotransmitter substances such as dopamine, serotonin, and oxytocin. Dopamine triggers craving³ and desire, serotonin elevates a person’s mood, and oxytocin is involved in forming emotional attachments⁴.

你知道人们为何接吻吗？问的好！人们接吻的原因十分简单——它会让人感觉良好。嘴唇上遍布着神经末梢，而神经末梢会激活大脑相应的神经区域。接吻能提高多巴胺，血清素及催产素等神经递质物质的水平。多巴胺会刺激人的欲望，血清素会提升人的情绪，而催产素会引发强烈的感情归属感。

Besides humans, the only animals that scientists have ever seen kissing are our closest ape relatives, chimpanzees, and bonobos, and even then it is a rare occurrence. There must be a better explanation for it.

除了人类，科学家发现唯一有接吻行为的动物是人类的近亲——黑猩猩和倭黑猩猩，即使在它们之中这种现象也极少发生。因此，人类要接吻应该还有更好的理由。

1 activate   

vt.使活动起来，使开始起作用

参考例句：

• We must activate the youth to study.我们要激励青年去学习。
• These push buttons can activate the elevator.这些按钮能启动电梯。

2 sensory   

adj.知觉的，感觉的，知觉器官的

参考例句：

• Human powers of sensory discrimination are limited.人类感官分辨能力有限。
• The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。

3 craving   

n.渴望,热望

参考例句：

• a craving for chocolate 非常想吃巧克力
• She skipped normal meals to satisfy her craving for chocolate and crisps. 她不吃正餐，以便满足自己吃巧克力和炸薯片的渴望。

4 attachments   

n.（用电子邮件发送的）附件( attachment的名词复数 )；附着；连接；附属物

参考例句：

• The vacuum cleaner has four different attachments. 吸尘器有四个不同的附件。
• It's an electric drill with a range of different attachments. 这是一个带有各种配件的电钻。