1)neighborhood basis,邻域基2)π-neighborhood base,π-邻域基3)open neighbourhood base,开邻域基4)pre-open-neighborhood base operater,预开邻域基算子5)the cardinal number of neighbrhood basis,邻域基的势数6)neighborhood,邻域（基本邻域）
用法例句
Neighbourhood system,open neighbourhood bases and bases in pre-topological spaces;
预拓扑空间的邻域系、开邻域基与基
Determining pre-topologies by pre-neighborhood system operater,pre-open-neighborhood base operater,or pre-base;
