1. They freed the birds from the cages.
   他们把鸟儿从笼子里放出来了。
2. He sold his birds separately to separate buyers.
   他把他的鸟儿分别卖给不同的买主。
3. I used to snare small birds such as sparrows.
   我曾常用罗网捕捉麻雀等小鸟。
4. Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.
   黄昏鸟是一种已经灭绝的不会飞翔的水鸟，生活在白垩纪晚期。
5. The birds circled around in the air.
   鸟儿在空中盘旋。
6. A great congregation of birds flew overhead.
   一大群鸟从头上飞过。
7. Fish, birds, and human beings are vertebrates.
   鱼、鸟和人类都是脊椎动物。
8. An adult Bateleur is an unmistakable bird.
   成年短尾雕是不容易与其他鸟类相混淆的。
9. These birds have a wide geographic distribution.
   这些鸟的地理分布很广。
10. The nesting instinct is proper to birds.
    筑巢是鸟类的本能。
11. He freed the bird from the cage.
    他把鸟从笼子里放了出去。
12. Many migratory birds visit this lake annually.
    许多候鸟每年到这个湖上作短期逗留。
13. Those birds have become more numerous lately.
    近来那种鸟变得越来越多了。
14. The boa feeds on birds and small mammals.
    蟒主要吃鸟和小的哺乳动物。
15. The birds rose and dip in their flight.
    鸟儿一上一下地飞翔。
16. Men and birds are fain of climbing high.
    不论人还是鸟都愿意往高处攀。
17. The birds fouled up his newly washed car.
    鸟把他新洗好的车弄脏了。
18. There was a bird sitting on the branch.
    一只鸟栖息在树枝上。
19. Sunshine and the singing of birds are cheery.
    阳光和鸟鸣令人愉快。
20. Unlike some birds, it does not dive vertically.
    和一些鸟不一样，这种鸟不垂直向下飞。

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