nonterminal class

例句：

1. 1.This nonterminal class is crucial for the development of a new software system.
   这个非终端类对于新软件系统的发展至关重要。
2. 2.The classification of nonterminal classes is essential for understanding the structure of the language.
   对非终端类的分类是理解语言结构的关键。
3. 3.In this paper, we will discuss the classification of nonterminal classes and their applications in machine learning.
   在本文中，我们将讨论非终端类的分类及其在机器学习中的应用。