| 1. | The cows were feeding on hay in the barn .
母牛正在牲口棚里吃干草呢。 |
| 2. | A cow's estrus cycle averages 21 days .
母牛的发情周期平均为21天。 |
| 3. | In-calf heifers are admirable for this work .
怀小牛的小母牛最适合这项工作。 |
| 4. | Sometimes, in the darkness, a cow coughed .
有时，黑暗中传来一阵母牛的喷鼻声。 |
| 5. | His cows got fat and his horses sleek .
她的母牛都上了膘，他的马匹养得毛皮油亮。 |
| 6. | His bull will come to serve our cows tomorrow .
明天我们用他的公牛与我们的母牛配种。 |
| 7. | That cow is a good milk-maker .
那头母牛产奶多。 |
| 8. | It seems that peaceful cows may be unfriendly bulls .
看来温顺的母牛也可能变成凶恶的公牛。 |
| 9. | Cows supply us with milk .
母牛供给我们牛奶。 |
| 10. | Each cow normally produces only one calf at a time .
在一般情况下，一头母牛每次只能产一头牛犊。 |
