mixed boundary problem

例句：

1. 1. The mixed boundaryproblem is a complex issue thatrequires careful consideration.
   混合边界问题是复杂的问题，需要仔细考虑。
2. 2. In thisstudy, we focused onthe mixed boundary problem in urbanplanning.
   在这项研究中，我们专注于城市规划中的混合边界问题。
3. 3. The solution to the mixedboundary problem is crucial for the successof the project.
   解决混合边界问题对于项目的成功至关重要。