When I am puzzled, I often scratch my head.

当我困惑的时候我总是挠头。

youdao

Scratch my head.

替我挠挠头。

youdao

"The more remote the location, the more I scratch my head and say, 'They are never coming back, '" Mr. Forster says.

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When I saw the comment, I had to scratch my head.

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As I tuck my pen into the place between the top two buttons on my shirt, I scratch my chin and the back of my head although neither itches.

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