本文提出了基于变量和表达式定义的三维实体建模方法，并采用这个方法实现了一个模板工具。
The thesis develops a method of solid modelling based on defining variables and expressions and implements a template tool.
上下文是简单的变量和表达式所需的函数，将返回一个值，并且赋值给标识，包括在符号表中的。
A context is simply the variables and functions that are needed by the expression to return a value, and are assigned to the identified included inside the Symbol Table.
每个规则定义含有一个可选描述、变量列表和一个表达式。
Each rule definition contains an optional description, a list of variables, and an expression.
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