- 1. 地球上的哺乳动物起源于何时？
- When did mammals appear on the earth?
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- 2. 海洋哺乳动物一般顺水而游。
- Marine mammals generally swim with the current.
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- 3. 只有约百分之五的哺乳动物是单一配偶的。
- Only about five percent of mammals are monogamous.
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- 4. 该疾病能够在不同的哺乳类物种之间传播。
- The disease can spread from one mammalian species to another.
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- 5. 食肉动物通常是有着复杂的社会关系的哺乳动物。
- Carnivores are usually socially complex mammals.
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- 6. 有人提出哺乳动物是在6 500万年前取代恐龙的。
- It has been suggested that mammals took over from dinosaurs 65 million years ago.
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- 7. 人类经历着一个迟来的成熟；我们进入生命各个阶段的时间比其他哺乳动物要晚。
- Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
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- 8. 鲸不是鱼类，而是哺乳类植物。
- Whales are not fish, but mammals.
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- 9. 大约35%的哺乳动物物种消失了。
- About 35 percent of mammal species were lost.
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- 10. 恐龙、昆虫和哺乳动物飞上了天空。
- Dinosaurs, insects and mammals took to the air.
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- 11. 很多哺乳动物已经到达这一点。
- Most mammals have reached this point.
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- 12. 哺乳动物是从母体中分娩出来的。
- Mammals are born alive from their mothers.
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- 13. 哺乳类动物的例子有人类，猪和狗。
- Some examples of mammals are man, pigs, and dogs.
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- 14. 大多数哺乳动物生活在陆地上。
- Most mammals live on land.
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- 15. 鲸是生活在海洋中的哺乳动物。
- Whales are mammals that live in the sea.
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- 16. 它是最不受保护的哺乳动物。
- It is the least protected mammal species.
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- 17. 大多数哺乳动物用脚趾走路。
- Most mammals walk on their toes.
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- 18. 蝙蝠是唯一能飞的哺乳动物。
- Bats is the only mammal that can fly.
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- 19. 蟒主要吃鸟和小的哺乳动物。
- Pythons mainly feed on birds and small mammals.
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- 20. 哺乳动物是什么时候出现在地球上的？
- When did the mammals appear at the earth?
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- 21. 猫、狗和猴子都是哺乳动物。
- Cats, dogs, and monkeys are some mammals.
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- 22. 猴子和狗都是哺乳动物。
- Monkeys and dogs are mammals.
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- 23. 松鼠是哺乳动物，对吗？
- Squirrels are mammals, right?
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- 24. 我对哺乳动物很感兴趣。
- I am very interested in mammals.
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- 25. 鲸鱼是一种哺乳类动物。
- Whale is a kind of mammals.
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- 26. 我们今天在课堂上学了有关哺乳动物的知识。
- We learned about mammals in class today.
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- 27. 骆驼是一种哺乳动物，但是几维鸟是一种鸟。
- The camel is a mammal, but the kiwi is a bird.
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- 28. 几乎所有哺乳动物身体外表都长了毛皮或毛发。
- Almost all mammals have fur or hair on their bodies.
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- 29. 相比于爬行动物，哺乳动物的这一特性更加典型。
- This is more typical of mammals than of reptiles.
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- 30. 并不是所有的大型哺乳动物都在那个时期灭绝了。
- Not all large mammals died out at that time.
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