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used to attract somebody’s attention or to express interest, surprise or anger （用以引起注意或表示兴趣、惊讶或生气）嘿，喂 - (especially North American English, informal)
used to say hello 那有什么要紧；没什么；管它呢 Hey, Jake! How are you doing? 嘿，杰克！你好吗？
used to show that you do not really care about something or that you think it is not important （表示不真正在意或认为不重要）嘿 - (South African English)
used at the end of a statement, to show that you have finished speaking, or to form a question or invite somebody to reply （用于陈述句末尾，表示话已说完，或构成问题或请求回答）就这样，怎么样，你说呢
Word Originnatural exclamation: first recorded in Middle English.