howdy和hello的区别：含义不同、用法不同。howdy只作感叹词，含义为你好，是非正式招呼用语；hello可作名词和感叹词，含义有喂、嘿、哈罗，可用于问候接电话或引起注意，表示惊讶等。
一、howdy的意思及用法
howdy作为感叹词，意为(招呼语)你好。
例句：Howdy, partner.
你好，伙计。
She shook hands with him, said," howdy, partner!"
她和他握手说“你好，伙伴”
Billy: Howdy, how are you all doing?
比利：你好，你们都还好吗？
Howdy docs. I am hoping that you can provide some insight into a bit of confusion I have.
医生你好。我希望你们能帮我解答一点困惑。
二、hello的意思及用法
hello可作感叹词和名词，含义有(用于问候、接电话或引起注意)哈罗，喂，你好;(表示惊讶)嘿;(认为别人说了蠢话或没有注意听)喂，嘿。
例句：Hello John, how are you?
哈罗，约翰，你好吗？
Hello, hello, what's going on here?
嘿，嘿，这是在干吗？
Hello? You didn't really mean that, did you?
嘿？你不会真是那个意思吧？
A moment later, Cohen picked up the phone. 'Hello?'
过了一会儿，科恩接起电话。“喂？”
She could see the open door of a departmental office. 'Hello! Excuse me. This is the department of French, isn't it?'...
她看到一个系办公室的门开着。“喂！请问，这是法语系，对吗？”
