Create a derived class inherited from the predefined grammar class.
创建一个从预定义grammar类继承而来的派生类。
The result is still an AST, but the parent class does most of the work for you. My grammar class looks like this
结果还是AST，但父类会为您执行大部分工作。
The grammar class is a template class that is parameterized by its derived class DerivedT and the context class ContextT. The declaration for the grammar class is as follows.
grammar类是一个模板类，被其派生类DerivedT和上下文类ContextT参数化。
She surprised everyone when she excused me from her grammar class, saying my time would be spent more productively writing in the library.
她免除了我的语法课，说我利用这个时间在图书馆写作会比上她的课更有成效，这决定让所有人都感到震惊。
She surprised everyone when she excused me from her grammar class, saying my time would be spent more productively writing in the library.
她免除了我的语法课，说我利用这个时间在图书馆写作会比上她的课更有成效，这决定让所有人都感到震惊。
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