非正式的可用hey; hi; hello; how do you do?/how are u doing?
正式的场合可以用Nice to meet u. /I've long heard of your name.久仰大名/It's a great pleasure to have you here with us.很高兴能请到你/I am pleased to meet u.我很高兴见到你/I'm delighted to make your acquaintance.我很高兴与你结识。等等
认识很久不见也有很多。long time no see.（最常用的）经常见面的朋友可用 what's up,man?(朋友间的） 正式点可用Small world,isn't it?我们又见面了
先要自我介绍一下喽，上来寒暄可以说nice to meet you 或 it is my pleasure to be friends with you之类的，之后就可以进入正题了
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