"how are you doing "means 近来怎么样，近来一切可好。 "how are you "是一种最常见的打招呼：你好，你好吗。 见面打招呼啊还有其他很多种方式，比如： how is it going ?_good ,how is it going with you what's up?-not much. 不要只局限于一种