relatively closed set

例句：

1. 1. In the study of computer science, a relatively closed set is a subset of a larger set that is not open to any other elements.
   在计算机科学研究中，一个相对封闭的集合是比它更大的集合的一个子集，这个子集不接受任何其他元素。
2. 2. The relative closed set of a set A is the intersection of all sets containing at least one element fromA.
   A的相对封闭集合是包含至少一个来自A的元素的所有集合的交集。
3. 3. The relative closed set of a set A is also known as the complement of A in its own set.
   A的相对封闭集合也被称为A在其自身的集合中的补集。