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。
So you're left scratching your head because you have a lot to say but you don't know how to say it.
所以你只有挠头了，因为你有好多话，却不知道该怎么说。
Nothing prevents you from writing some perfectly hideous code and then scratching your head over how you are going to test it.
您可以很轻松地编写一些非常恶劣的代码，然后费劲脑筋地想办法测试。
If you find yourself scratching your head trying to recall a name, run apropos (or the equivalent man -k). For example, if you're hunting for a calculator, simply type apropos calculator.
如果您正在努力回想一个命令名，那么试试apropos(或等效的man -k)。
If you find yourself scratching your head trying to recall a name, run apropos (or the equivalent man -k). For example, if you're hunting for a calculator, simply type apropos calculator.
如果您正在努力回想一个命令名，那么试试apropos(或等效的man -k)。
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