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Greeting teachers wherever you meet them is a minimum of politeness and respect.
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There is no essential difference between meeting a teacher in this toilet and meeting a teacher in other places. Just don't say some awkward hellos, like. Have you eaten?
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Hello! See you here; It's such a coincidence, and I'm even anxious: I haven't seen you for a long time, what have you been busy with lately: I can meet you here! Fate and so on. When you meet an acquaintance in the toilet, it is best to say hello in the above language!
Of course I want to.,It's just a hello.,It's nothing.,Don't say hello when you meet a leader cheating.。。。
I met in the toilet to see the situation, if it was me, I would smile and nod, so it would mean hello, after all, it is not suitable for chatting in such an environment, and the taste is not very good.
If you don't know it, feel free, just say that the teacher is good.