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。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.