Farm workers milked cows by hand.
农场工人们手工给奶牛挤奶。
The cows are artificially inseminated.
这些母牛被人工授精。
The cows are out now, grazing in the pasture.
牛群现在出去了，正在牧场上吃草。
Five cows graze serenely around a massive oak.
5头奶牛在一棵大橡树附近安静地吃草。
The gadget is used to artificially inseminate cows.
这件小装置用来给奶牛进行人工授精。
The feeding of dairy cows has undergone a revolution.
奶牛的喂食已经历了一场革命。
We picked the corn by hand and we fed it to the hogs and the cows.
我们掰下玉米，用来喂猪和奶牛。
The cows' rumps were marked with their owner's initials and a number.
这些奶牛的臀部上标有它们主人姓名的首字母和一个数字。
When his cows calve each year he keeps one or two calves for his family.
每年他的母牛产犊时，他都为家里留下一两头。
Before silos were invented, cows gave less milk during winter because they had no green grass to eat.
筒仓发明之前，因为没有青草可以吃，奶牛在冬天产奶量减少。
是奶牛。我喜欢奶牛。
He likes to chase cows and horses.
他喜欢追赶牛马。
You can see lambs, cows and horses.
你可以看到绵羊、牛和马。
我们给奶牛喂草吃。
奶牛为什么要挂铃铛？
牛以草为食。
为什么奶牛要吃草呢？
我有十三头奶牛。
Some care for farm animals like horses and cows.
有些人喜欢饲养马和牛等农场动物。
There are chicks, ducks, pigs, dogs, and cows on his farm.
他的农场里有小鸡、鸭子、猪、狗和奶牛。
Livestock, like cows and sheep, also consume large amounts of crops.
和牛羊一样，家畜也消耗了大量的农作物。
Scientists have found that cows are very social animals and a cow always makes friends with other cows.
科学家们发现，牛是一种非常合群的动物，一头牛总是和其他牛交朋友。
The high prices encouraged the peasants to improve their animal husbandry techniques; for example, they began feeding their animals indoors in order to raise the milk yield of their cows.
高昂的价格鼓励农民提高畜牧业技术；例如，为了提高奶牛的产奶量，他们开始在室内喂养动物。
Now, only 3 percent of families follow the agricultural model, but nearly all schools are scheduled as if our children went home early to milk the cows and took months off to work the crops.
现在，只有3%的家庭遵循农业模式，但几乎所有的学校都安排得好像我们的孩子要早早回家挤牛奶，或者花几个月的时间种田一样。
Families depend on their cows.
这里的家庭依靠家里的奶牛谋生。
你挤过奶了吗？
"The cows can't be milked now," he said.
“奶牛现在不能挤奶了。”他说。
Boys herd cows. Girls collect firewood and water.
男孩们放牛。女孩们收集柴火和水。
They have worked with cows since they were children.
他们从小就和牛打交道。
I heard the clank of buckets as the farm workers went to milk the cows.
我听到农场工人去挤牛奶时牛奶桶发出的当啷声。
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