“乳牛”的拼音为：rǔ niú...

乳牛的喂养方法发生了巨大的改变。The feeding of dairy cows has undergone a revolution.不能既想卖乳牛,又想喝牛奶.You cannot sell the cow and sup the milk.大多数乳牛约10个月后就不再有奶了.Most cows run dry in about 10 months....

“乳牛”的英语可以翻译为：dairy cattle，milch cow，milker ...