scratching_your_head_有道手机词典

1.Waving can mean welcome and farewell, whereas scratching your head may indicate that you are at a loss.
挥手表示欢迎和告别，而挠头则表示不知所措。
dict.yoduao.com
2.I could see you scratching your head.
我能看到你摸不着头脑了。
dict.yoduao.com
3.All this might have you scratching your head.
所有这一切可能会让你百思不得其解。
dict.yoduao.com