Translation of "نظنه" in English

صنع هذا العنكبوت الصغير هل هذا غبار, ما نظنه؟

This tiny spider has created-- is that dust or what are we thinking?

ولكن السبب وراء هذا قد لا يكون ما نظنه،

But the reason that this is the case is not what we might think,