几位农民拉着旄牛耕地，牛鼻子上拴着大大的鼻环。
A few farmers trailed yaks , with plows attached to their animals by large nose rings .
秦汉时期，牛的类型主要是黄牛、水牛、旄牛三种，其中以黄牛为主。
In Qin-Han Dynasties , the types of the cattle were mainly classified of the scalper , buffalo , yak .
旄牛