资料来源 : pyDict

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Hello \Hel*lo"\, interj. & n.
   See {Halloo}.

资料来源 : WordNet®

hello
     n : an expression of greeting; "every morning they exchanged
         polite hellos" [syn: {hullo}, {hi}, {howdy}, {how-do-you-do}]