当某一小族群单独地处在比它大的他族群之中，就可以称之为族群岛。最常见的族群岛 是与主体族族体相脱离并经迁徙而在另一地域形成的人类群体，有的原住居民因别的族群迁入而被迫形 成族群岛。族群岛往往是一个小社会，又处在比它更大的异族群之中，在内外交往过程中一般表现出较 强的凝聚力和适应能力，但也常常成为种族灭绝的对象。在进行族群分类研究时，族群岛是一个极为有 价值的概念。 When a small ethnic group alone in his larger than his ethnic group, you can call it a tribe. The most common ethnic islands are the human groups separated from the main ethnic group and migrated in another region. Some indigenous people are forced to form ethnic islands because of the immigration of other ethnic groups. Ethnic islands tend to be small communities, but they are still in a larger alien group. They generally show strong cohesion and adaptability in internal and external exchanges, but they are also often the targets of genocide. Ethnic islands are an extremely valuable concept in the study of ethnic classification.