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Once upon a time, it was all out war between competing ethnic groups.
曾几何时，四夷乱华，战火纷飞。
《China from Above》《鸟瞰中国》
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When the city became a republic in 1965, few thought a country with so few resources and of vastly different ethnic groups could succeed.
新加坡于 1965 年宣布独立，当时有些人认为这个国家缺乏天然资源，又融合太多民族，难以获得成功。
《10 Cities Vacation Travel Guide》《10大名城旅游攻略》
双语例句
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Some ethnic groups can't become acclimatized to the mainstream.
一些种族群体不能适应主流。
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They've been living and working peacefully with members of various ethnic groups.
他们一直与各种族群的成员们和平地生活和工作。
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They promote social integration and assimilation of minority ethnic groups into the culture.
他们提倡少数民族团体与该文化的社会融合及同化。
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Different cultural features of ethnic groups are in tune with one another and work out a melody.
各民族不同的文化特征相互协调，谱成一首旋律。