Noun:

1. an expression of greeting;

   "every morning they exchanged polite hellos"
   

howdyint.您好(招呼用语)

hiint.嗨(引人注意时的喊声；打招呼)

helloint.(打招呼)喂；你好

how-do-you-don.尴尬的局面；你好吗(用作寒暄)

1. Hullo, old bean. What are you doing here?
   喂，老兄，你在这里干什么？
2. Hullo! Who's that, taking my name in vain?
   喂！是谁在那儿议论我？
3. Hullo, Jane. I wondered it you'd be here. How's the world been treating you since I saw you last?
   喂，简。我不知道你会在这儿。自上次分手后你还过得好吗？