{//规则：Robert 和 John 是男性
public static IExpression getMaleExpression()
{
IExpression robert = new TerminalExpression("Robert");
IExpression john = new TerminalExpression("John");
return(new OrExpression(robert, john));
}
//规则：Julie 是一个已婚的女性
public static IExpression getMarriedWomanExpression()
{
IExpression julie = new TerminalExpression("Julie");
IExpression married = new TerminalExpression("Married");
return(new AndExpression(julie, married));
}
