你好 is hello
嗨 is basically just hi
basically, 嗨 is very casual
你好 is safer and more formal
July 26, 2015
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Agreed with the previous answers.
你好 hello
嗨 hi
July 27, 2015
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Say 你好 to everybody while say hi or hello to you close friends.
July 27, 2015
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Just add something to @havoy's answer.
When you know sb for the first time, you'd better say '你好'. At the same time, you can say '嗨/嘿' to those guys you know each other.
July 26, 2015
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We prefer using 嗨,because it's more international than 你好.And 你好 is more formal than 嗨
August 2, 2015
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