Well, a fair definition of tickling is touching parts of the body in a mock attack.

胳肢的准确定义就是,打打闹闹时碰身体某个地方。

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They're throwing out insults, maybe they're tickling each other, maybe they're making fun of each other, maybe they're making fun of themselves, and there's some aggression to it.

他们会说伤人的话，胳肢别人，取笑对方，取笑自己，而这些打闹是有一定的侵略性的。

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There was a set of scientists interested in studying tickling.

很多科学家对研究挠痒痒非常感兴趣

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And then you'll see-- And what's tickling?

然后…,胳肢是什么？

耶鲁公开课 - 心理学导论课程节选