怎么说呢

zěn me shuō ne

Why is that?; How come?

zěn

how

me

suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc

shuō

to speak; to talk; to say

ne

particle indicating that a previously asked question is to be applied to the preceding word ("What about ...?", "And ...?")