parallel tables meaning in English

对照图表

If your virtual mailboxes must be owned by different user / group ids , and if it is too inconvenient for you to maintain three parallel tables , use an ldap or mysql database ( or generate the three parallel tables from one common template )
如果你的虚拟邮箱必需使用不同的用户/组标识号，并且如果你觉得维护三张并行的表太困难，那么使用一个ldap或mysql数据库来保存这些数据（或者从一个公共的模板中派生中三张并行的表）。
Secondly , this paper discuss basic conception and general structure of expert system mainly , analyzes merits and faults of some algorithm deeply , on the basis of that , presents a fan fault diagnosis expert system based on rough sets theory by field reality . with the relation of fan ’ s symptom and fault , structures symptom - fault parallel table which is simple and clear . reduces knowledge base by rough sets , establishes inference rules through forward inference , overcomes the “ bottle neck ” problem of knowledge acquisition of expert system by combining fuzzy theory with rough sets
然后着重论述了专家系统的基本概念和一般结构,介绍了粗糙集理论的研究基础以及在故障诊断中的应用,深入分析了几种算法的优缺点,在此基础上结合现场实际构建了基于粗糙集的风机故障诊断专家系统的体系结构。利用风机征兆和故障之间的关系构造了征兆故障对照表,关系简单明了。