第1个回答 2008-10-30
It's too difficult for us to solve the problem.
第2个回答 2008-10-30
It is too hard for us that it was impossible to solve.
第3个回答 2008-10-30
It is too difficult for us to solve it.
第4个回答 2008-10-30
For us, too difficult to solve
第5个回答 2008-10-30
It is too difficult to settle for us