◆科技苑20160921期◆大开眼界(41) 白牦牛 蕨麻

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彪悍的牦牛，牧民们为什么要冒险绑定它?草原旱獭能找到的一种美食，究竟是什么?一种牛羊不吃的神秘植物，当地人又会拿它干什么呢?《科技苑》为您揭晓。