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。
Both are difficult people problems to solve.
这些都是难以解决的人际问题。
Some problems are difficult to solve.
有些问题很难解决。
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。
Many problems when you really want to solve, perhaps is not that difficult.
很多问题当你真的想要去解决的时候，或许并没有那么难。
In fact, social problems are not difficult to solve.
至于其它社会问题，其实不难解决。
In fact, to solve these problems is not that difficult.
其实，解决这些问题并不困难。
They are mainly applied to solve difficult optimization problems.
这些算法主要是解决优化问题中的难解问题。
With a lot of difficult problems to solve, the manager felt very upset.
有许多难题要解决，经理感到很心烦。
Without it some problems may be difficult to solve.
不搞整风，恐怕解决不了问题。
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。
So it is much more difficult to solve the multi-objectives optimization problems.
因此，多目标优化问题的求解变得困难。
I manage to solve difficult problems if I try hard.
如果我尽力去做的话，我总是能够解决难题的。
I manage to solve difficult problems if I try hard.
如果我尽力去做的话，我总是能够解决难题的。
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