scratch his head
挠挠头
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Bill tends to scratch his head while thinking.
比尔在思考时常常会抓头。
youdao
His message perplexed his mind to that degree that he was fain, several times, to take off his hat to scratch his head.
他带回的信息使他很为迷惘，好几次都想脱下帽子搔一搔头皮。
If he scratches his head, you scratch your head.
如果他挠头，你也挠头。
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