abstract entity造句

• Characters are abstract entities that can be represented using many different character schemes or code pages
  字符是可使用多种不同字符方案或代码页来表示的抽象实体。
• Based on analyzing and abstracting entities and their relationships of rmro, e-r graph illustrating the main contents of rmro is proposed
  本文首先分析了制造资源优化配置中的实体和关系，建立了其总体的实体一关系模型。