Bill tends to scratch his head while thinking.
比尔在思考时常常会抓头。
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。
If he scratches his head, you scratch your head.
如果他搔搔头，你从头开始你的头。
If he scratches his head, you scratch your head.
如果他搔搔头，你从头开始你的头。
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