cow，侧重于母牛。cattle，主要指家畜。
cow
【读音】：英 [kaʊ] 美 [kaʊ]
【释义】：n.奶牛，乳牛;母兽;雌（象，鲸等）;<侮辱>对女性的蔑称；vt.恐吓;吓唬;威胁
【用法】第三人称单数： cows 复数： cows 现在分词： cowing 过去式： cowed 过去分词： cowed
cattle
【读音】：英 [ˈkætl] 美 [ˈkætl]
【释义】：n.（总称）牛，牲口;畜生;无价值的人;〈美俚〉女学生
【用法】：复数： cattle
【例句】
cow：
He kept a few dairy cows
他养了几头奶牛。
The government, far from being cowed by these threats, has vowed to continue its policy.
该政府丝毫没有被这些威胁吓住，发誓要继续执行其政策。
You can initiate policies until the cows come home, but unless they're monitored at a senior level, you won't get results.
你可以花很长时间来制定政策，但除非高层对之进行监管，否则不会有效果。
Dad went out to milk the cows.
爸爸出去挤牛奶。
cattle：
Farmer Brown's cattle are branded with the letter B.
农场主布朗的牛都烙上了字母“B”的印记。
Kangaroos compete with sheep and cattle for sparse supplies of food andwater
袋鼠与牛羊争夺稀少的食物和水。
The cattle had trodden a path to the pond.
牛群踏出了一条通往池塘的小径。
The thunderstorm stampeded the cattle.
大雷雨惊了牛群。
His herd of 170 dairy cattle and 200 young stock are kept on the land.
他那170头奶牛和200头乳牛都在那块地上圈养。