FROM 0 TO 1
Hello Hi Hey
Hello 不熟悉的人
Hi 熟悉的人
Hey[yyyyyy] 熟悉的人，有调侃的意思How are you?
How are you doing?
How is it going?
How have you been?
What's up?Nice to meet you. meet you 连读 第一次见面 或 偶遇寒暄很短，要分别可以说
Nice to meet you, too.
It's nice metting you. (Metting you is nice)
Nice to see you. (>=2