dialect area的用法和樣例：
例句
- In order to solve the problem of communication between people from different dialects areas, we study mandarin.
為了解決來自不同方言區的人們之間的交流問題，我們學習普通話。 - Native dialect is the largest obstacle of Putonghua study for the students in the dialectal areas.
母語方言是方言區學生學習普通話的最大障礙。
