For more information about valid expressions, see expressions in the Debugger.
有关有效表达式的更多信息，请参见调试器中的表达式。
When restrictions are applied, all valid expressions entered thereafter can be represented in either language.
当应用语法限制时，所有之后输入的有效表达式都可以使用任何一种语言表示。
Once a language and the grammar that formally describes it becomes complex, however, the number of valid expressions in the language grows rapidly.
但是，一旦正式描述它的某种语言和语法变得复杂，那么语言中的有效表达式数量将迅速增加。
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