“难解决的问题”可以翻译为 "a difficult/tough/hard problem to solve" 或 "a problem that is difficult/tough/hard to resolve"。
以下是一些例句，展示这个短语在不同语境下的使用：
1、 This is a difficult problem to solve, and we need more time to think about it.
（这是一个难解决的问题，我们需要更多时间来考虑。）
2、 The team faced a tough problem to solve, but they managed to find a solution in the end.
（团队面临了一个难解决的问题，但最终他们还是找到了解决方案。）
3、 Finding a balance between work and life is a hard problem to resolve for many people.
（对许多人来说，在工作和生活之间找到平衡是一个难解决的问题。）