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鱼龙混杂
[词典] dragons and fishes jumbled together; good and bad mixed together; good and bad people mixed up; The bad became mixed with the good.;
[例句]在革命高潮时期，各种人都来参加，未免泥沙俱下，鱼龙混杂。
During the high tide of the revolution, all kinds of people flocked to join; so inevitably the waters were muddied and the bad became mixed with the good.