If he scratches his head, you scratch your head.
如果他挠头，你也挠头。
It means to scratch your head in order to help you remember something you've forgotten.
这意味着你抓耳挠腮以使自己想起你遗忘的东西。
At times when you are confused, you scratch your head.
有时候，当你感到困惑，你挠你的头。
At times when you are confused, you scratch your head.
有时候，当你感到困惑，你挠你的头。
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