system of closed sets [数] 闭集系
family of closed sets [数] 闭集族
gcd-closed sets 最大公因数闭集
regular closed sets 正则闭集
maximal closed sets 极大封闭集
disjoint closed sets 互斥闭集
Regular order homomorphic mapping and regular continuity concepts are introduced by concepts of regular closed sets in LF topological spaces.
利用正则开（闭）集引入LF拓扑空间之间的几种正则序同态和几种正则连续性，并讨论了它们的性质及其相互关系。
In fuzzy topological space, some sets are not closed sets, but they display some characteristics of clsed sets on some stratiform, if is so-called stratiform closed set.
在模糊拓扑空间中，有些集合本身并不是闭集，但在某些层次上它却表现出闭集的特性，这就是所谓的层次闭集。
The dam must be closed before the rainy season sets in, or all our Labour will be lost.
大坝一定要在雨季开始以前合拢，否则就会前功尽弃。
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