解析表达式语法（PEGs）编写简单、易于维护。
Parsing expression grammars (PEGs) are simple to write and easy to maintain.
一个函数必须处处都有相同的解析表达式。
A function must have the same analytic expression throughout.
进而由几何关系给出了谐振波长漂移规律的解析表达式。
Further more, the analytic express of the rules was gotten by geometric analysis.
而且这些区域的解析表达式一般无法求解，是电子战作战态势分析中的难点。
Also their resolution equation could not be got. So drawing them is difficult.
如果遇到一个整数，则表达式是有效的，解析器将完成工作。
If it encounters one, the expression is valid and the parser is done.
既然已经进行了解析，我们就需要对单个表达式采取行动了。
Now that we've parsed, we need to take action on the individual expressions.
单个整数表达式的解析树的图片。
图1：单个整数表达式的解析树。
模式解析器必须支持正则表达式。
The schema parser must have support for regular expression facets.
函数曲面可由解析函数表达式来表达，建模方便。
The function surface can be expressed by analytic expression and constructed easily.
我目前想数学表达式解析为表达式树。
I'm currently trying to parse math expression into expression tree.
我目前想数学表达式解析为表达式树。
I'm currently trying to parse math expression into expression tree.
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