zěn me huí shì
what's the matter?
what's going on?; how could that be?; how did that come about?; what's it all about?
怎
zěn
how
么
me
suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc
回
huí
variant of 迴|回[hui2]
事
shì
matter