The article studies some relative topological properties through three respects: relative T1 space, relative T2 space, relative regular space, relative normal space.
本文从下列三个方面：相对T1空间、相对T2空间，相对正则空间和相对正规空间讨论了某些相对拓扑性质。
Locany S-Closed Space is extremally disconnected if and only if every semi-regular S-closed set relative to X is Closed set.
本注记给出局部S-闭空间X是极不连通的充要条件是X中每个相对X是S-闭的半正则于集是闭集。
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