给我挠挠背–我痒痒。

Scratch my back – I've got an itch.

他的胡须扎得她的面颊痒痒的。

His beard was tickling her cheek.

比我高大的女孩过去总是追赶着挠我痒痒。

The bigger girl usually chases me and tickles me.

头脑里出现的想法就好像是被蚊虫叮了一样：您需要抓痒痒，这样做才感觉舒服一些。

An idea is like an itch: you need to scratch it, and when you do it feels better.