- 谁解决了这个难题？
Who solved the hard problem?
- 我很难解决这个问题。
I had difficulty working out the problem.
- 这个问题都被解决了。
The matter is all settled.
- 这个问题仍然未解决。
The problem remains unsolved.
- 没有人能够解决这个问题。
Nobody can solve this problem.
- 我明白怎么解决问题。
I understand how to solve the problem.
- 这个问题让小学生解决太难了。
This problem is too difficult for primary school children to solve.
- 我在解决这个问题上有困难。
I had difficulty in solving this problem.
- 请找到问题的解决方法。
Please find a solution to the problem.
- 告诉我你是如果解决这些问题的？
Tell me how you got over such troubles?
