Grammar Note
多作定语修饰名词，如 regional differences；也可作表语，如 The differences are regional.
地区的；区域的
先理解核心含义，再看它在真实句子里的用法。
地区的；区域的
of or relating to a specific region or large geographic area
The company plans to open three regional offices next year to serve local customers better.
公司计划明年开设三个地区的办事处，以便更好地服务当地客户。
特定地區或區域的
Of, or pertaining to, a specific region or district.
地區特有的
characteristic of a region
大地理區域的
Of, or pertaining to, a large geographic region.
與特定地區有關或限於特定地區的
related or limited to a particular region
Each regional dish has its own unique taste, so you should try them when you travel.
每道地方菜都有自己独特的味道，所以旅行时你应该尝尝。
AI contextual example
The hospital is the main regional center for heart surgery in this part of the country.
这家医院是这个国家这一地区的主要区域性心脏手术中心。
AI contextual example
regional flora
区域性植物群。
WordNet
a regional dialect
一种地方方言。
WordNet
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多作定语修饰名词，如 regional differences；也可作表语，如 The differences are regional.
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 4，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.