Nice to meet you.(适用于第一次见面)很高兴见到你。Nice to see you again.(适用于曾经见过,但不太熟的人)很高兴再次见到你。How have you been?(适用于有一阵子没见面的朋友)你过得怎么样?Long time no see.(适用于很久没见的朋友)好久不见。How is it going?近况如何?How's everything with you?