Hello!/ Hi!
Good morning!/ Good afternoon!/ Good evening!
How are you？
I'm fine, thank you. And you？
Nice to meet you.
Glad to see you.
It's very nice to have a chance to meet you.
How's everything going？
How's everything with you？
Long time no see.
这些句子适用于不同的场合和关系，可以根据具体情境选择合适的表达。例如，在正式场合可以使用“Good morning”或“Good afternoon”，在较为随意的环境中则可以用“Hi”或“Hello”。