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Even today many bird fanciers are still highly resistant against feeding.
尽管时移势易,但今时今日仍有不少鸟迷对类胡萝卜素浓缩抱著抗拒态度.
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Copying this logic, bird fanciers started color feeding their birds.
抄袭了这逻辑, 鸟迷开始以含有类胡萝卜素的食物为笼鸟造色.
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