Nice to SEE you / Nice to MEET you / How do you do?
Nice to SEE you用在认识的人打招呼，Nice to MEET you用在不熟或初次见面的场合。How do you do?多用在比较正式，且与他人初次见面的场合。
How are you doing? / How’s it going? / How’s everything? / Howdy!
这几句都是「你好吗？」的意思，万用句，而Howdy!是 How do you do?的简化版。
