咍
hāi
(interj.), happy, sound of laughter
嗨
oh alas, hey!, hi! (loanword), a high (natural or drug-induced) (loanword)
咳
sound of sighing, (interjection expressing surprise, sorrow, regret, disappointment etc) oh, damn, wow
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嗨，我很高兴见到你
hāi， wǒ hěn gāo xìng jiàn dào nǐ
Hi, nice to meet you