Zài yīxiē dìqū, kuà mínzú de záhūn yǐjīng hěn pǔbiàn.
In some regions, inter-ethnic mixed marriages are already very common.
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usage
杂婚 has two senses: anthropological (group/promiscuous mating in primitive societies, contrasted with 群婚 and 对偶婚) and sociological (mixed marriage across ethnic or national lines). Context disambiguates.