Why do Americans display such affection in a public place?

为什么美国人在公共场合会表现出这样的情感呢？

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People of different ages and genders show affection in different ways.

不同年龄和性别的人表达感情的方式不同。

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Males accomplish this feat by embracing the object of their affection in a tight mating "hug" called amplexus.

雄蟾蜍要完成这一壮举，必须紧紧拥抱自己的“心上人”，即“抱合”。

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But in the United States Senate, I can think of no one who engendered greater respect or affection from members on both sides of the aisle."

VOA: standard.2009.08.26

In this pamphlet, this prose treatise, Milton is looking back at this exuberant affection for the very idea of chastity that he had held in his youth.

在这个小册子散文论文中，弥尔顿正在回顾这个贞操观点,对年轻人产生的非凡影响。

耶鲁公开课 - 弥尔顿课程节选

Some worry about alienating effects, as youngsters seek companionship and affection in microchip and plastic.

CNN: Virtual Nurture

And the American paid tribute to the crowds who have shown him such affection in his 14 Wimbledon campaigns.

BBC: SPORT | Tennis | Emotional exit fantastic - Agassi

It is not uncommon to see young people singing Happy Birthday or organizing other public displays of affection in Moscow.

FORBES: For 2012 Russian Pres Elections, 'Big Brother' Will Be Watching