Learner's definition of HEY
1
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used to attract someone's attention or to express surprise, joy, or anger（用于引起某人注意或表达惊喜、开心、愤怒等）嘿，喂 -
Hey (there), it's good to see you!嘿，见到你真开心！
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Hey, wait for me!喂，等等我！
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Hey, what are you doing with my car!嘿，你干吗动我的车！
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Hey you!—get away from there!嘿，说你呢！——离这儿远点！
2
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used to indicate that something is not important, that you are not upset about something, etc.用于指某事并不重要，没因某事而生气等 -
I thought she was my friend, but, hey, it's not the first time I've been wrong.我原以为她是我的朋友，但是，嘿，这可不是我第一次搞错了。
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“We lost.” “Hey, you can't win them all.”“我们输了。”“嘿，你们不可能总赢他们的。”
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“I'm sorry to be so late.” “Hey, don't worry about it.”“很抱歉我来得这么晚。”“嘿，没什么关系。”