领域模型是领域知识的一种图形化表示形式，是领域知识各组成部分的抽象。
Domain models represent graphical presentation of domain knowledge and derive from the parts of domain.
领域模型是领域知识的一种图形化表示形式，是领域知识各组成部分的抽象形式，同时领域模型也表示了领域内各系统的一些共同特征。
Domain models represent graphical presentation of domain knowledge and derived from the parts of domain, meanwhile, domain model shows the common characteristics of systems in domain.
由于编译器是对符号进行操作的，因此我们可以采用文本或图形化的形式来表示符号。
Because compilers operate on symbols, you can express symbols textually or graphically. Reasons for text expressions include.
图形化表示有自己的语法和语义，它们不过是将这些文本语言形式化了。
Graphical representations have syntax and semantics that are just as formalized as those of textual languages.
图4给出同一文档的图形化表示；有些人觉得后一种形式更容易理解。
A graphical representation of this same document is shown in Figure 4; some people find the latter easier to read.
图4给出同一文档的图形化表示；有些人觉得后一种形式更容易理解。
A graphical representation of this same document is shown in Figure 4; some people find the latter easier to read.
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