开放集; 开集

open sets───开放集

open sea───公海；远海

open cut───明挖；明堑；揭露剖面

open out───展现；展开；直言

open pit───adj.露天采矿的

open secret───公开的秘密

open sides───宽阔边（争球点到边线较宽的一侧，橄榄球比赛术语）

boxed set───盒装图书

open city───开放城市；不设防的城市

The boundary of a contains a nonempty open set.───的边界包含一个非空开集。

In point set topological theory, open set and neighborhood are the basic concept.───在点集拓扑理论中，开集、域等是最基本的概念。

Originally, the nine planets already known dance open set, it has been encouraging in the dress!───本来，九大行星早就知道舞会开定了，现已振奋地在打扮呢！

Some properties of Z - Scott open set, Z - Lawson open set, Z - Scott topology and Z - Lawson topology are studied.───研究了Z - 连续偏序集上的Z-Scott开集, Z -Lawson 开集, Z-Scott拓扑及Z -Lawson 拓扑的一些性质.