所有不产奶的牛应从奶牛中清除出来.All passengers should be eliminated from dairy herds.那些牛产奶很多.The cows are milking well , ie giving large quantities of milk.那些母牛不产奶.The cows are dry , ie not producing milk....

“产奶”的拼音为：chǎn nǎi...

“产奶”的英语可以翻译为：give milk，milk production ...