bidialectism

例句：

1. 1. The study of regional dialects is a crucial aspect of linguistics.
   研究地方方言是语言学的一个重要方面。
2. 2. Dialectologists argue that language is not fixed but rather evolves over time.
   方言学家认为语言不是固定的，而是随时间演变的。
3. 3. The concept of dialect is often used to describe the differences between different regions within a single language.
   “方言”这一概念通常用来描述一种语言内部不同地区之间的差异。