enclave
/ˈenkleɪv/noun
1- a portion of territory within or surrounded by a larger territory whose inhabitants are culturally or ethnically distinct飞地（指位于另一较大领土境内的小块领土, 居住着隶属不同文化和种族的居民）。
1.1
- figurative a place or group that is different in character from those surrounding it〈喻〉与周围人群（或地方）有着不同特征的人群（或地方）：
the engineering department is traditionally a male enclave.
工程部传统上是男人的天下。
词源
mid 19th cent.: from French, from Old French enclaver 'enclose, dovetail', based on Latin clavis 'key'.