该语法说明了该语言中的合法表达式包含。
This grammar states that a legal expression in this language consists of either.
确保表达式所有部分都被认为是合法的。
Makes sure that all parts of the expression are recognized as legal tokens.
确保表达式从合法的符号开始。
确保表达式以合法符号结束。
首先，为了对类型参数构造合法的new表达式（如 newT() ），必须确保我们调用的构造函数对于 T 的每个实例化都有效。
First off, in order to form a legal new expression on a type parameter, such as new T(), it's necessary to make sure that we're calling a constructor that is valid for every instantiation of T.
如果正在传递给解析器代码的表达式不能根据语法合法地构造，则将抛出ParseException或LexicalError。
If the expression you're passing in to the parser code can't be legally constructed according to the grammar, either a ParseException or a LexicalError is thrown.
因此表达式Hi和2 * 2都是合法的XQuery代码，不需要任何准备或者修改就能执行。
So both of the expressions Hi and 2 * 2 are valid XQuery code that will execute without any prelude or modification.
表达式是否合法取决于操作数的类型，而且合法的表达式其含义也由其操作数类型决定。
The type of the operand (s) determine whether an expression is legal and, if the expression is legal, determines the meaning of the expression.
怎么判断一个数值表达式是否合法！
一个合法的谓词演算表达式，即谓词演算语法所允许的公式。
A legitimate expression of the predicate calculus. That is, it is acceptable under the predicate calculus' syntax.
任何合法的正则表达式都可以在这里使用。
在非稳流下，采用函数拟合法，得出流体切向速度随半径变化的表达式及流体所受切向剪切力和分布曲线。
Secondly, in conditions of non-steady flow, azinuthal velocity and shear stress distribution were deduced according to function approximation method.
在非稳流下，采用函数拟合法，得出流体切向速度随半径变化的表达式及流体所受切向剪切力和分布曲线。
Secondly, in conditions of non-steady flow, azinuthal velocity and shear stress distribution were deduced according to function approximation method.
应用推荐