In itself, it's not a difficult problem to solve.
这本身并不是个难解决的问题。
She is working at a difficult problem in mathematics.
她在做一道数学难题。
It's really a difficult problem.
这真是个难题。
At first there was a seemingly difficult problem.
在开始的时候存在一个难题。
Never have I come across such a difficult problem.
我还从没有遇到过这样困难的问题。
He's working on a difficult problem.
他正在研究一个困难问题。
We have a difficult problem to solve.
我们面临一个难以解决的问题。
Let me think over this difficult problem.
让我仔细思考这道难题。
The difficult problem had not been solved.
这个难题还没有得到解答。
He was wrestling with the difficult problem.
他在苦思解决那个难题的方法。
How did you deal with that difficult problem?
你是怎样解决那个难题的？
I do need some advice on a difficult problem.
我的确有一个难题要请教你。
He helped me deal with this difficult problem.
他帮助我处理了这一难题。
He soon turned his attention to the difficult problem.
他很快把注意力转到这个难题上。
Jim solved the difficult problem with their help.
在他们的帮助下，吉姆解决了这道难题。
He has been wrestling with the difficult problem.
他一直在努力解决这个难题。
He succeeded in working out this difficult problem.
他成功地做出了这道难题。
The greatest scholar cannot solve this difficult problem.
再伟大的学者也没有办法解答这个难题吧。
He is too clever not to solve the difficult problem.
他很聪明，一定能解决这个难题。
He felt inadequate when faced by a difficult problem.
他面对难题觉得力不从心。
Fortunately, it's not a difficult problem (see Listing 6) to fix.
所幸的是，这个问题不难解决(见清单6)。
There is no doubt that he has solved this difficult problem.
毫无疑问他已经解出了这道难题。
It is the most difficult problem that I have ever worked out.
这是我所做过的最难的题目。
He is so clever that he could work out such a difficult problem.
他很聪明，把那么难的问题都解出来了。
Once he is present, the difficult problem can be readily solved.
他一来，问题就迎刃而解了。
Our professor is too capable not to solve this difficult problem.
我们教授非常有才干，必定能解决这一难题。
If a problem can be solved by money, it is not really a difficult problem.
如果一个问题可以用金钱得到解决，那么它就不真是一个困难的问题。
If a problem can be solved by money, it is not really a difficult problem.
如果一个问题可以用金钱得到解决，那么它就不真是一个困难的问题。
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