Question

这是一个很大的问题（很难回答的问题）翻译成英文

这是一个很大的问题（很难回答的问题）翻译成英文

Answer 1

this is a very difficult question.

Answer 2

this is a very difficult problem

Answer 3

sarcasm?
That's a good question.

or
if not sarcasm
This question's very hard to answer. :p

Answer 4

this is a very difficult question to answer

Answer 5

this is a serious problem