抽象语法树是一个表示为对象集合的表达式。
An abstract syntax tree is an expression represented as a collection of objects.
如果您的数据可以容易地表示为简单对象而不是像字符串和数字这种分离的值时，它会很有用。
This is useful if your data is easily expressed as simple objects, rather than as separate values like strings and Numbers.
每个拓扑对象都表示为一个符号，并带有显示其与其他对象的关系的行。
Each topology object is represented by a symbol with lines showing its relationship to other objects.
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