relating to a particular race, nation, or tribe and their customs and traditions

种族（民族，部落）的; 具有种族（民族; 部落）特色的:

The school teaches pupils from different ethnic groups .

该校教授不同种族的小学生。

ethnic Russians in Estonia

居住在爱沙尼亚的俄罗斯人

The students are from a variety of ethnic backgrounds.

学生有着不同的种族背景。

plans to partition the republic along ethnic lines (=in a way that keeps different ethnic groups apart)

把共和国按不同种族分割开来的计划

ethnic cooking / fashion / design etc, cooking, fashion etc from countries that are far away, which seems very different and unusual

具有异国风情的烹调/时尚/设计等:

ethnic music

具有异国风情的音乐

Surinam is culturally and ethnically diverse.

苏里南在文化和种族方面具有多样性。

someone who comes from a group of people who are a different race, religion etc or who have a different background from most other people in that country

少数民族的一员:

In that neighborhood of New York, we were all ethnics.

在纽约的那个街区，我们都是少数民族。