The script engine has some components, include symbol table, lexical analyzer, parser, semantic checker, intermediate code generator, optimizer, code generator, virtual machine.
一个脚本引擎通常包括的组件有：符号表、词法分析器、语法分析器、语义检查器、中间代码生成器、代码优化器、代码生成器、虚拟机。
Represents a symbol writer, and provides methods to define documents, sequence points, lexical scopes, and variables.
代表符号写入器，并提供定义文件、序列点、语汇范围和变数的方法。
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