这个问题超越社会经济的所有界限，影响各个年龄段的人。
The problem cuts across all socioeconomic lines and affects all age groups.
在一段令人兴奋的关系中，拥有界限分明的个人空间很重要，这并不过分。
In a thriving relationship, the importance of significant personal space cannot be exaggerated.
再得到与之对应的各类变分原理，界限定理，第二阶段问题的边界积分方程。
Then correspondently, we obtain the specific variational principles, bounded theorems, and boundary integral equations of the second stage problems.
应用推荐