嗨
hāi
oh alas
hey!; hi! (loanword); a high (natural or drug-induced) (loanword)
嗨,你今天看起来很累。
hāi, nǐ jīn tiān kàn qǐ lái hěn lèi。
Hey, you look really tired today.
她一看到老朋友就大声喊了一声嗨。
tā yī kàn dào lǎo péng yǒu jiù dà shēng hǎn le yī shēng hāi。
As soon as she saw her old friend, she called out a loud hi.