hi 

hello   

how are you

how do you do          

甚至Joey的How are you doing也算是啊 

How's everything going?

Howdy!

What's up?

这些都是常用的口语“你好”的表达方式

如果你还停留在"Hello?""How are you?""How do you do?"的层次上，那你可能要听不懂外国人说话了哦哦。