她的嘴唇靠近他的头，她的气息轻挠他的耳朵。

Her lips were close to his head and her breath tickled his ear.

《柯林斯英汉双解大词典》

奥斯卡认真地嗅了嗅，然后站起身向我走来，让我轻轻地在耳朵后面挠他。

Oscar sniffed it intently, then stood up to move toward me, allowing me to gently scratch him behind the ears.

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如果他挠他的脖子，你也挠你的脖子。

If he scratches his neck-you scratch your neck.

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And in fact, an example of a methodological attempt was done by Henry Gleitman at University of Pennsylvania, who built a tickle machine, which was this box with these two giant hands that went "r-r-r-r."

实际上,宾夕法尼亚大学的亨利·葛雷曼,曾经进行过研究方法上的尝试,他发明了一台挠痒痒的机器,这是一个装有两只大手的箱子,双手会不停的去挠痒痒

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