The problems are difficult to solve.
这些问题很难解决。
It's difficult to solve these mathematical problems.
解决这些数学问题很困难。
Why is the obesity problem in Britain so difficult to solve?
为什么英国的肥胖问题如此难以解决？
The problem will not be difficult to solve, if properly handled.
如处理得当，问题不难解决。
It is a problem difficult to solve.
这是一个难解决的问题。
This problem is difficult to solve.
这问题难以解决。
I meet a problem difficult to solve.
我遇到一个难以解决的问题。
Some problems are difficult to solve.
有些问题很难解决。
A problem is very difficult to solve.
很难处理的问题。
It is difficult to solve this problem.
解决这个问题很困难。
This problem seems difficult to solve.
这个问题似乎很难解决。
I find it difficult to solve the problem.
我发现解决这个难题很难。
I found it difficult to solve this problem.
我发现很难解决这个问题。
The problem of cost is too difficult to solve.
成本问题的解决太难了。
Without it some problems may be difficult to solve.
不搞整风，恐怕解决不了问题。
In fact, social problems are not difficult to solve.
至于其它社会问题，其实不难解决。
Why has the Needham Problem been difficult to solve?
“李约瑟难题”为什么成了难解之题?。
I found (it) not very difficult to solve the problem.
我感到解决此问题不难。
This is the question which extremely difficult to solve.
这是个极难解决的问题。
The problem is difficult to solve in field of bellows designing.
该问题是波纹管设计的难点之一。
It is always difficult to solve nonlinear dynamic response problems.
几何非线性的动力响应问题求解，一直是力学中的难点。
This is quite a complicated problem and one which is difficult to solve.
这是一个相当复杂的问题，这是一个难以解决的。
This is a case even Sherlock Holmes might have found difficult to solve.
这可能是一例福尔摩斯也难侦破的案件。
It's not difficult to solve such problems, following the teacher's advice.
按照老师的建议来解决这类问题就不困难了。
Not only is the problem very important, but also it is difficult to solve.
这个问题不仅重要，而且难以解决。
It is very difficult to solve the indefinite integral with general method.
用常规方法求解不定积分问题是相当困难的。
It is very difficult to solve the indefinite integral with general method.
用常规方法求解不定积分问题是相当困难的。
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